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The Japanese Society for Plant Systematics

NII-Electronic Library Service

The JapaneseSociety for Plant Systematics

Apri1, 1982 Acta Phytotax. Geobot. 23

HyPnum saitoi, a New Species of Moss from Japan"

Hisatsugu ANDo**

reslK.ts("* : HJ2is ee7x4 u"trntci)rapt Hypnum

saitoi

Mr. M. SAJTo

sent me

for

my monographic work of

topnum

many specimens of

this

genus

which

he had

col!ected

in Hokkaido,

northernrnost oftheJapanese

four

main

islands.

During

a study of

those

specimens,

I

encountered a

distinct

sample

that

appeared much

Iike L!>Pnum Plicatulum CLiNDB.) JAEG.

et

SAuERB,, but

microscopically

diflbred in

several

characters ofboth stem and

leaves. Similar p!ants

were

found

subsequentlyin collections

from two

other

localities in

the central mountainous area ofHonshu.

These

specimens

wcre all sterile,

but they

seemed

to

represent an undescribed species and

I preliminarily

published it

under

the

name,

IZ>Pnum

saitei,

but left it

undescribed

(ANDo, 1972).

Since then, I have

expected

to find fruiting

specimens ofthe sarne moss,

but

regret-

fu11y it

was not

successfu1. Even from

only

its

.crametophytic

foatures, I

now conclusively

believe that this

moss

is

a new species and

here decide to give

a

description.

Hypnum

saitoi

ANDo,

sp. nov.

(Fig. 1)

IijPnntm

saitoi

ANDo,

nom nud.,J.

Hattori Bot. Lab. 35: 69,

£

4, I972.

Dioicum, tenellum,

caespitosum,

Caulis

repens,

pinnatim

ramosus, ramis com-

planatis. Pseudoparaphyllia filamentosa

vel subfilamentosa,

longa. Felia

caulina

falcato-secunda

vel circinata, ovato- vel oblongo-]anceolata, subcordata, apice sensim acuminata, marginibus superne

distincte

serrulatis, nervis

binis,

obsoletis, cellulis medianis

linearibus, (40-)50-60C-70) ptm longis

et

34 pm latis,

superis

interdum

angulo

papillose

extantibus,

basilaribus infimis Iuteo-fuscis,

alaribus subquadratis vel rectangularibus, a

marginibus

3-5. Folia

ramea minora et an.crustiera.

Fructus ignotus.

Dioicous. Plants

small,

in

closely

interwoven

mats,

light yellowish-green, glossy.

Stems prostrate,

up

to 4

cm

long,

oval

in

cross-section, with a slightly

developed

central

strand, not

hyalodermous, loosely pinnate-branched; branches

spreading er ascending, comp!anate, uneven

in length, 2-5mm long. Pseudoparaphyllia filarnentous to

sub-

filamentous,

rarely narrow-lanceolate, rather

long

and

distinctive. Stem leaves falcate-

secund

to

circinate, ovate- or oblong-lanceolate,

1.2-1.5

mm

long, O.45-O.60

mm wide,

*

Contribution from'th'e' Plly-t'otaxonomical & Geobotanical Laboratory, Hiroshima University, N. Ser.

No. 236.

**

Botanical Institute, Faculty

ofScience,

Hiroshima University, Higashisenda-machi, Hiroshima 730.

73o JxuTtirt]gm=FNwr, Ei{uj<\mp\$tsig\&$

(2)

The Japanese Society for Plant Systematics

NII-Electronic Library Service

The JapaneseSociety forPlant Systematics

24 Acta Phytotax. Geobot. Vol. XXXM

tw 6,b £ glPSg-,t/ilio'E h

Sgoo.QCtPRE

gA

K

,//tt/(Su.

[)i-・ a

s.

'i'i

L( tzr

.. g

''",

- ii

/...fil,-

-,

u

-)

"t'?/'

,,//t'lt, ,.t/,/, '//t//t.,g.l/ ,.-,t..

E ''

'},{s L

"t.K, M

&sgJ

( III fo

P

z.R

x

l/'・g

1

:

Z

fi(fik

s F

u,Jtl1

c

)Q

T

H

-

-'n

-' a・

Kl

Fig. I. 2btPnuon

saitoi

ANDo. A-Q. drawn from

the

type, R,-U. from 72ikaki 17733.

Ieaves. C-E. Basal

anglcs ofs.-1.

F. Medlan

cells efs.-1.

G, H. Apical parts

ofs,-1.

?lant. J. Pscudoparaphyllia, K. A part

of the cross-section ofstem.

N,O.Basalanglesofb.-1. P,Apicalpartofbrl. Q.Mediancellsofb,-1

T. Apical part

ofs.-1. U.

Median

cells ofs.-1.

A, B, L, M, R, S,

×

28; I,

others, ×

270.

u

A, B. Stem

L

L,

M. Branch leaves.

. R,S.Stemleaves.

×

1; J,

×

67; the

sometimes more or

less

asymmetric at

base,

not or slightly

decurrent, from

a subcordate

base gradua!ly

narrowed

into

a

Iong,

rarely short acumen, scarcely

plicate;

margins

sharply serrulate above,

plane,

sometimes slightly recurved

below;

costa

faint

or

indistinct;

(3)

The Japanese Society for Plant Systematics

NII-Electronic Library Service

The JapaneseSociety for Plant Systematics

April, 1982 Acta Phytotax, Geobot. 25

...-...-.- ...-... .. .t... ..

median cells

(40050-60(-70) psm long

and

34 psm

wide

in lumen;

upper cells sometimes

papillose

at upper angles;

basal

cells

thicker-walled,

colored with

yellow

at

insertion;

alar cells subquadrate to rectangular, usually

tinged

with

brown, 3-5

along

the

margin,

in 4-5

rows, sometimes accompanied

by

one

te two larger, hyaline

cells at

the

extreme angles.

Branch leaves

smaller and narrower oblong-lanceolate,

O.9-1.2

rnm

long, O,25- O.35

mm wide; other characters almost

the

same as

in

stem

leaves. Sporophyte

unknown.

Typus: Mt. Rakkodake-Mt. Tokachidake, 1370

m alt.,

Hokkaido, +Racomitrium

.f}zsciculare (Ieg. M. SAiTo; Aug. 4, l956; M, S,-26718 in HIRO).

Other

specimens examined.

Hokkaide. Mt. Rakkodake-Mt, Tokachidake,

+Raaomitriermfasciculare (leg. M. SAiTo; Aug. 4, 1956; M, S.-26720 in HIRO). Honshu.

Pref Nagano: Mt. Kisokoma,

near

the

summit,

2900

m alt., en

humus, +Dicranum

viride

var.

hakkodkense

and

Pohlia

sp.

(leg. N. TAKAKi; July 22, 1957; AIL 7-:-17733 in HIRO);

Mt. Kimpuzan,

on

granite

rock under

PinusPumila, +Pohlia

eruda

(leg, I. NAGANo; July

26, 1952; L IVL-20I5 in HIRO).

Habitat. On

rocks or

humus in

the upper area ofthe subalpine zone where

Pinus

Pumila

scrubs

predominate.

Range. Endemic toJapan (Hokkaido

and

Honshu) ;

apparently rare and

diajunctive in

surnmit areas of

high

mountains.

The

specimens available

for the

study are enly a

few, but

they show some variations

in leaf features. A

collection

by Dr. N. TAKAKi from Mt. Kisokema includes plants in

which

leaves

are shorter-acuminate and

laminal

cells are sherter and wider,

30-50 pam Iong

and

4-5 pam

wide

in lumen (Fig. I

:

R-U).

This

species

is

not easy

to

reco.crnize,

but

a combination of

the following

characters will

provide

a

guide for identification: 1) plants

are small and

loosely pinnate-branched;

2) leaves

are subcerdate and with sharply serrulate acumen;

3) basal

cells of

leaves

are

usually colored with

yellow to brown; 4)

alar

parts

are

diflerentiated,

consisting ofsub-

quadrate to

rectangular cells

that

are

8-5

along the margin and

in 4-5

rows;

5)

upper cells of

leaves

are sometimes

papillose

at upper angles;

6) pseudoparaphyllia

are

filamen-

tous to

subfilamentous and

long.

In general

appearance,

It7Pnum

saitoi most closely resembles

H. plicatulum (sect. Hamu-

losa)

which occupies

the

same

habitat

on

high

mountains ofJapan, and

the two

species are very

diMcult to

separate

in

the

field, but H.

saitoi

is distinguished

microscopically

by

the

non-hyalodermous stem,

the

marked!y serrulate

leaves (almost

entire

in H. plicatulum)

and

the better-differentiated

alar cells.

As I

once commented

(ANDo, 1972), H,

saitei

is

also comparable with

South

American HL

skottsbergii

ANDo (Chile

and

Argentinai

sect.

Plartilia), but the latter is diflerent in being

autoicous and

having less

cordate

leaves

narrowed

into

a moTe slender

acumen.

This

species, although

its

sporophyte

has

not

been dctected, is

considered

to be placed

morc appropriately

in

sect.

H)/Pnum

subsect.

Lijpnum

which

is typified by HL

czipressijbrme

(4)

The Japanese Society for Plant Systematics

NII-Electronic Library Service

The  Japanese  Sooiety  for  Plant  Systematios

26 Acta

 

Phytotax

 

Geobot VoL

 

XXXIII

HEDw .

 

In

 

fact

 solne  ofits  characters  are  similar  

to

 

those

 ofH

 cm

ψ

re

 

7耀  

fbr

 example

pseudoparaphyllia

 arc  equally

lamentous

 

to

 subfilamentous  and  alar  cells  of  

the

 

leaf

are  well  

differentiated

 

fbrming

 small  

but

 clcarly  

de

且ned  areas

 

In

 

the

 small  size of

plants

 and  

the

 sharply  serrulate  

leaves

 with  similar  areolation  

H .

 saitoi 

bears

 

a

 

closest

resemb 至ance  

to .

 cupre

var

 fnamillatum  

BRiD .

 alnong  others  which  

is

 a 

distinct

 racc

d

stributed  

in

 

Europe

 and  

thc

 eastern  

part

 of 

North

 

America ,

 

hut

t

 

differs

 

in

 

the

 more conspicuously  cordate  

leaves

 and  

the

 

lcss

 

dif

brelltiated

 alar  

parts

 where  subquadrate  ce呈

1s

are  

3− 5

 along  

the

 margin  as against  

7 12

 

in

H .

 cuprezforme  var

 mammillatum

   Acknowledgement

Iam

 

grateful

 

to

 

Mr .

 

M

 

SAITo

 who  

has

 

kindly

 supplied  me with  a 

large

 collection  ofH )

pnum

 

from

 

Hokkaido

 and  

to

 whom  

the

 name  efthe  new  species

was  

dedicated .

  斉 藤 実 氏 ( 元 北 海 道 立 教 育 研 究 所 長 )

氏 が

北 海

地 で

採 集

し たヶ 属

( Hyp −

num

標 本

多 数 分 け

た だた が

H ・plicatulum (

ミ ヤ

く 似

顕 微 鏡

形 質

は か な

り異

て い

標 本 2

。 共

楽 古 岳 か ら十 勝 岳

途 中

海 抜 1370m

地 点

採 集 さ れ

の で

巌 博 士 (埼

大 ) が 長 野 ・ 山 梨 県 境

金 峰 山

林 下

ま た

高 木 典 雄 博 士 (

愛 知 学 院 大 ) が 木 曽 駒

付 近 (海 抜 2900m

採 集 さ れ

の が

る こと が

れ ら

標 本

は いず れ

も不 実

た め

子 体

不 明

あ る が

偶 体

特 徴

け か ら

未 記 載

思 わ

れ た の で

Hypnum

saitoi と

命 名

, 1972

裸 名

ま ま 発 表

( ANDo

 

i

 

972

 

れ 以 来 , 胞 子 体

わ す

待 し た が

, 1

加 標 本

す ら

れ な ま ま

現 在

上 記

新 種

あ る と う 確 信 は

,世 界 中

研 究

を さ ら に

め て き た

層 強 く , ま

完 全 標 本

得 られ

可 能 性

思 わ れ

だ け

く も

の で あ る が こ こ に 正

記 載 文

る こに し

  先 述 し

た よ

本 種 は

く高 山

な ど

分 布

す る

H .plicatulum

く似

て い

外 観 的

相 似

す ぎ ず

顕 微 鏡 下

最 外 層

細 胞

分 化

ず ,

明 瞭

鋸 歯

,方

翼 細 胞

区 別

( H .plicatulum

最 外 層

細 胞

内 側

隣 接 す

る も

り大

薄 膜

葉 は ほ

ん ど 全

翼 細 胞

化 が 少 な

 

翼 部

比 較 的

分 化

し て

偽 毛 葉 が 糸 状

狭 披 針 形

と な ど

, 本 種

H .

cupress 三

forme

s

ゴ ヶ

近 縁

あ り , 本

分 類 体 系

れ と 同 じ

イ ゴ

イ ゴ

亜 節

と 思

わ れ

H .

 cupressiforme

地 域 を

い て

世 界

両 半 球

広 く分 布

す る 種 し か

中 第 一

わ れ

程 多

多 数

変 種

品 種

発 表

さ れて い る が

H .

 cupressiforme  var

 mammillatum

北 米 東 部

分 布 し ,

見 られ

, 本 種

て いる よ う

し か し var

 mammillatum は

種 ほ ど

臓 形

に な

らず , 方 形

翼 細 胞

が は

( H .

saitoi

は葉 縁

沿

3 〜 5 個

る が var

 mammillatum で は

7 〜12

) 点

て い

N工 工

Eleotronio  Library  

(5)

The Japanese Society for Plant Systematics

NII-Electronic Library Service

The  Japanese  Sooiety  for  Plant  Systematios

April

1982 Acta

 

Phytotax .

 

Geobot . 27

  H .

saitoi は

高 山

3 産 地

ら知 られ

る と 思

わ れ

Reference

ANDo

 

H . 1972 .

 

DiStributien

 and  speCiation  

in

 the 

genus

 

H

pnum

 

in

 

the

 circum

Pacific region

 

J

 

Hattori

   

Bot ,

 

Lab . 35

68− 98

  小 山 博 滋

 

オ オ

変 種

と し

さ れ た

MAKINO

1917

そ れ よ

り前

MAKINo

1890

別 種 と し認 識 さ れ

の で

。 52 年 後

し て

別 さ れ

今 EI

で こ の

KITAMuRA

1942

対 す

て い な い

( HARA

1952

OHwI

1956

HATuslMA

1975

KITAM .

 et aL

1981

な ど

分 布 域

西

済 州 島

琉 球

小 笠 原

台 湾

中 国

印 度 支

タ イ

に 至 る

lc 対

オ オ

の そ

狭 く ,

西

本 か ら台 湾 ま

で で

 

れ ら

者 は

大 き

お よ び

花 数

果 実

き さみ ら れ る 違

別 さ

て い る が ど ち ら と

が た

標本

に し ば し ば

出 会 う

卵 形

葉 身

長 さ

5cm

巾 2 5

 cm

内 外

が 多 く

は 長

円 形

3cm

巾 Icm

し か し

大 き

さ は

個 体 内

も 匍匐 枝

異 な る な

ど 変 異

形 は 卵 形 か ら 長

円 形

き さ は

1c111

ら 12

 cm

連 続 的

変 異

こ の

られ

斜 上 枝

頂 生 す

る 頭

頂 芽

み が 発 達 す る と

1 個

と な

れ ぞ れ 発 達

る と

3 個

と な る

1

オ オ

3

が 多

個 体 内

頭 花 数

な る

が あ

3 個

花 を

斜 上 枝

代 り

2

側 枝 を

を 同

一 個体

が あ

る な

花 数 も中 間

型 が あ

続 す

両 者

を 明

別 し 得 る よ う な 形

見 あ

い の

は 互

種 関 係

変 種 関 係

る と

自 然

と 考

え る

 

な お

学 名

命 名 規 約 第 72 条

に よ

Wedelia

 

prostrata

 

HEMsLEy

し な

れ ば な ら な

   Wedelia

 

prostrata

 

HEMsLEY

 

in

 

Journ

 

Linn .

 

Soc

 

Bot . 23

4341888

OHwI

 

Fl .

Jap 1200 1956

 

Eng

 ed

900 1965

KITAM

 

in

 

Acta

 

Phytotax .

 

Geobot 24

18 1969

HATuslMA

 

Fl .

 

Ryukyus

630 1975

LAuENER

 

in

 

Notes

 

Roy .

 

Bot .

 

Gard .

 

Edinb . 34

349 ( 1976

incl,

 syn

LI

 

FL

 

Taiwan

 

IV

961 ( 1978

LING

 

FI .

 

Reipub .

 

PopuL

 

Sin 75

353 1979

KITAM .

 

et

 aL (

olL

 

IIL

 

Herb .

 

Pl .

 

Jap ( Sym 64

 

pL

 

20 151 1981

   Verbesina

 

prostrata

 

HooK .

 et 

ARN .

 

Bot .

 

Beeche

s 

Voy .1951837

  non  

I. .(1753 ).

   var .

 robusta  

MAKINo   in

 

Journ Jap

 

Bot 1

23

 

fig 2 ( 1917

  

robusta

MAKINo ) KITAM .

 

Comp .

 

Jap

 

III

258 1942

HARA

 

Enum 、

 

Sperm .

Jap

 

II

279 ( 1952

OHwl

 

Fl .

 

Jap 1199 1956

 

EIlg .

 ed

. 900 1965 )

HATusIMA

 

Fl.

Ryukyus

630 1975

KITAM .

 et aL  

ColL

 

Ill .

 

Herb .

 

Pl .

 

Jap ( Symp . ) Rev .

 ed

. 64 ( 1981   

.岬

or¢

DC . ’

MAKINo

 

in

 

Bot

 

Mag .

 

Tokyo

 

4

87 1890)。

                                       ( H .KoyAMA )

N工 工

Eleotronio  Library  

Fig. I. 2btPnuon saitoi ANDo. A-Q. drawn from the type, R,-U. from 72ikaki 17733.

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