METHODS 



. r ,f the fuot, which is somewhat bulbous, *h 

 Jitulosa the foot is pointed and merges more or less gradual)) 

 the seta. P. Ltvieri is somewhat intermediate between P. Zdlmfcr 

 idiculosa in the form of the foot 



Fig. 19. 



A. Section of a young sporophyte of P. ZoUingrri, in which the 



mother-cells and elaters are differentiated ; x 25. 



B. Part of the sporogenous region, showing spore-mother cells, tf, 



ebters, ?/. 



C. Foot of the sporophyte. 



Young ftporophytes of P. Ln-itn. x 25. In there was a second abort! t 

 sporophyte, sp\ within the calyj 



he capsule develops the wall becomes clearly delimited from the 

 sporogenous tissue within The wall is composed of about three layers 



iroughout most of its extent. In P. Zotlingeri (Fig. 18, C 



i co-layered also, or sometimes four-layered at the apex, the outer 

 layer having the cells conspicuously larger than the two inner la 

 P. radiculosa (Fig. 21, /f) the wall at the apex of the capsule is much 



rid forms a conspicuous beak. P. l.n-ifri is intermediate in this 

 respect also between P. Zollingrri and P. rodiculosa* 



The sporogenoiiv n P. Zotlmgfri forms at first a somewhat 



