Organography of plants, especially of the archegoniatae and spermaphyta . Fig. 140. Lycopodium inundatum. i, few-celled prothallus ;/?, basilar cell. 2, prothallus with antheridium, ^«; i/, injuredcell. 3, older prothallus with antheridia, Aft, and meristem, M\U, injured cell; b, basilar cell. 4, prothallus with archegonia, A,and an embryo showing cotjdedon, Co, and protocorm, B. Allmagnified ; after De Bary. Fig. 141. Pro-thai us with arche-gonia, A. ^lagniCed. deal with an inherited character from a primitive chlorophyllous prothallusor with a condition produced by int
Organography of plants, especially of the archegoniatae and spermaphyta . Fig. 140. Lycopodium inundatum. i, few-celled prothallus ;/?, basilar cell. 2, prothallus with antheridium, ^«; i/, injuredcell. 3, older prothallus with antheridia, Aft, and meristem, M\U, injured cell; b, basilar cell. 4, prothallus with archegonia, A,and an embryo showing cotjdedon, Co, and protocorm, B. Allmagnified ; after De Bary. Fig. 141. Pro-thai us with arche-gonia, A. ^lagniCed. deal with an inherited character from a primitive chlorophyllous prothallusor with a condition produced by internal causes. 3. THE GAMETOPHYTE IN THE SEVERAL GROUPSOF PTERIDOPHYTA. We must now shortly describe the formation of the prothallus in theseveral groups in order that we may discuss how far we can recognize orconstruct relationships between them. We shall begin with the Lyco-podineae because here the sexual organs show a relatively primitive con-struction as has been already indicated :— A. GAMETOPHYTE OF THE ^. In recent years the formation
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