22 



The thallus is dichotomously branched, about 5—8 cm. in length and 

 1 — 1.5 cm. in breadth, bears numerous rhizoids on the median ventral 

 surface. The main portion of the thallus consists of several layers of 

 cells, but the marginal portion being of one layer. The sexual organs 

 are borne on the dorsal median surface near the apex. 



Archegonia are in group, covered by a slightly dentated involucre on 

 the dorsal side (Fig. 1, $). Capsule of the sporogonium is oblong elliptical, 

 dark brown in color, and with a long white seta (Fig. 1, sp.). The form 

 of the capsule is one of the points of external difference between the 

 present species and Fellia, in which it is spherical. Calyptra cylindrical, 

 projected high above the involucre, which remains something like a fold in 

 the base of the dorsal half of the former. The elater is long, tapering 

 in both ends, having two spirals fused togather to form a long continuous 

 thickening in one side (Fig. 3). The spore is comparatively small and 

 nearly spherical ranging from 20 to 25 [i in diameter (Fig. 4). Its 

 wall is thick and much thicker in one side than in the other half. It 

 contains a nucleus, and some chlorophyll, and has the markings of reticulated 

 ridges on the outer surface. It seems that the spore does not divide 

 into many cells before dispersing, as we can see in Pellia and Couo- 

 cephalus. 



Antheridia are in group and immersed in the tissue of the thallus 

 at the bottom of a somewhat cup-shaped depression, on the apex 

 of a thallus, which is bordered on the hinder side by a crescent- 

 shaped ridge, while its front part, having no border or ridge, passes 

 gradually into the apex of the thallus (Fig. 5). Longitudinal median 

 section through that part of the thallus may give a more correct idea 

 (Fig. 6). When the antherihia are ripe, they burst out and their contents 

 are seen as white milky fluid on the depression. If we take a drop of 

 it on a slide and examine under the microscope, we can see a great 

 number of spermatozoids in free motion, or still enclosed in the mother 

 cells. When I first examined it, my attention was called at once to 

 the great size of the spermatozoid. The long spirally twisted body with 

 a pair of cilia could be easily distinguished with a low power as 2xB, 

 Zeiss. 



The spermatozoids were fixed by the vapour of osmic acid, and stained 

 with fuchsin-iodinegreen. The main body of the spermatozoid which is 

 derived from the nucleus of the mother cell is stained blue, while the 

 narrower apex and the somewhat thickened hinder part, which are said 

 to be derived from the cytoplasm stained red. A pair of long cilia, 



