Organography of plants, especially of the archegoniatae and spermaphyta . ^^s-\^ w h Fig. 144. Hemitelia (Amphicosmia) Walkerae. Development of pro-thallus. I, young prothallus ; w/t, rhizoid. 2 and 3, older prothalli, eachwith two vegetative points, f, v. Magnified ; 1 more highly so than 2 and 3. HEART-SHAPED PROTHALLI OF POLYPODIACEAE 201 much as such epiphytic prothalli evidently can only develop archegoniain special favourable conditions, and they live vegetatively between times ;.

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