524 



LIFE-HISTORIES 



Fig. 348. — Peat mosses. ,4, part of a ganietophyte, enlarged, showing male 

 branches (a, a, n, a) and female branches {h, h). B, part of a leaf (S. 

 cymbifolium), ajft, showing the not-work of green cells surrounding the 

 large ones which fill with water or air. C, vertical section through a 

 small piece of leaf (S. cuspidatum) showing the small and the large 

 perforated cells, 'i". D, cross-section through outer part of stem 

 (S. cymbifolium) highly magnified. E, male branch of S. acxdifoliwn, 

 ■with a vegetative branch at the base, Y. P^ same, with many pseudo- 

 leaves removed to show the male gametangia {antheridia), '•^i. G, an 

 opened and empty antheridium, -f«. H, five cells containing young 

 spermatozoids, ■>■?«. J, such a cell nearly ripe, ■ija. K, spermatozoid, 

 ^<'-. L, ripe "fruit" (sporophytc) with remains of the archegonium at 

 its base borne on a stalk continuing the axis of the pseudo-stem which 

 bears pseudo-leaves at its base; magnified. (Schimper.) 



