Fig.1.11. Psilotum sp. A, mature spore; B, optical section of spore; C, germinating spore first stage; D, next stage in the germination of spore; E, formation of the first cells of the prothallus; F-J, successive stages of the development of the prothallus.

Psilotum

Fig.1.11. Psilotum sp. A, mature spore; B, optical section of spore; C, germinating spore first stage; D, next stage in the germination of spore; E, formation of the first cells of the prothallus; F-J, successive stages of the development of the prothallus.

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