March 1969 The Journal of Geobotany Vol. XVII. No. 1 correct. Even in one and the same frond we can observe such cross揖c

March 1969 The Journal of Geobotany Vol. XVII. No. 1 correct. Even in one and the same frond we can observe such cross

tions as the田 two extreme types. Where semi-transparent margin is distinctly developed, the crc闘

世c

tion coincides with the CHING

s figure, but where no such margin is developed the

’

s figure.

cross section is the same as the OGATA

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