39 
B. Capsule not pedicellate, without neck. Spores 
very large, 0,1- 0, mm. Prothallium not persistent. 
162. Archidium. Capsule globose; columella wan- 
ting. Calyptra rudimentary or ieres splitting. Leaves 
often distant. 
IL. Ephemerec. Stem wanting or indistinct. Leaves 
often nerveless, smooth or (seldom) papillose-spinulose. 
. Capsule globose without neck, immersed. Prothallium 
persistent. Plants minute. 
= A. Leaves smooth. 
163. Ephemerum. Capsule not or indistinctly pedi- 
cellate; columella rudimentary or complete, more or less 
fugacious. Calyptra campanulate or (in one species) sub- 
cucullate. Leaves often nerveless. Spores 0,02 —0,os mm. 
Prothallium abundant. Dioecious. 
164. Nanomitrium. Capsule not pedicellate, colu- 
mella wanting. Calyptra campanulate-mitriform, very small. 
Leaves nerveless. Spores about 0,os mm. Prothallium . 
not abundant. Paroecious. 
B. Leaves papillose-spinulose -on both sides and on 
the costa. 
165. Ephemeridium (new genus). Capsule indi- 
. stinetly pedicellate; columella wanting. Caiyptra campanu- 
late, somewhat large. Spores 0,» mm or larger. Pro- 
thallium not abundant. Dioecious. | 
i Fam. 36. Voitiaces. — | 
166. Voitia. Capsule oval-oblong or globose. 
Fam. 37. Physcomitrellacez. 
eee 167, Physcomitrella. Capsule | subglobose, irregu- 
larly splitting. Calyptra split or faintly crenulate at base, 
Scarcely covering the point of the capsule. | : 
| 168. Aphanorhegma. | Capsule globose or a ce 
Oveting more than: the » puis int of the ca n o 
egularly and horizontally splitting. 5 Calyptra | lobulate, te, aoe 
