MUSCI.—ANDREAEACEAE, PHASCACEAE, BRYINEAE. 



185 



exhibit the same internal dififerentiation of the capsule as the true Mosses, though 

 in a rather more simple form, the genus Archidium, as was stated above, differs 

 considerably from them. The stalk of the sporogonium swells, as in Sphagnum, 

 and even recalls the Hepaticae ; the roundish capsule bursts the calyptra at the 



Fig. 140. Archidium phascoides. A longitudinal section of the young- 

 sporogonium showing the mother-cell m of the spores ; / foot of the sporogo- 

 nium. 7v wall of the capsule, i the intercellular space, c the cells round the 

 mother-cell. B longitudinal section through the young sporogonium witli the 

 calyptra and vaginula ; h the cavity from which the mother-cell of the spores 

 has fallen, -' the vaginula, st tl:e stem, b the leaves, a the neck of the arche- 

 gonium. After Hofmeister, magn. 200 times. 



Fig. 141. Anhidium phas- 

 coides. Longitudinal section 

 through a nearly mature sporo- 

 gonium ; iv wall of the sporogo- 

 nium, sp the spores, 1/ the vaginula, 

 b leaves of the stem s. After 

 Hofmeister, magn. 100 times. 



side, and does not carry it up with it as a cap. Other points of difference have been 

 already mentioned. 



4. In the Bryineae or true Mosses the sporogonium has always a stalk, the jrA?, and 



Fig. 142. Fiiiinj-ia hyf:romctrica. A a young leafy stem s^ ^^'t'' 

 the calyptra c. £ a plant ^ with the almost mature sporogonium, of 

 which J- is the seta, y the capsular portion, c the calyptra. C longi- 

 tudinal section of the capsular portion dividing it into two symmetri- 

 cal halves ; d the lid, a the annulus. / the peristome, r, c' the 

 lir-space, j- archesporium. 



Fig. 143. Tlie nioutli of the tlitca A' 

 of Fotttinalis atitipyrelira. Outer peri- 

 stome apt inner peristome ip. After 

 Schimper. magn. 50 times. 



usually a long one ; the seta is cylindrical, bluntly pointed at the lower end, and firmly 

 fixed in the vaginula ; the capsule opens by throwing off its upper portion as a lid, the 

 operculum, which either separates simply and smoothly from the lower part of the 



