224 
to a narrow basal membrane, free, or adherent to the teeth in two 
species of Pylaisiella; cilia rudimentary or wanting. Spores 
roughened. 
Distinguished from the Brachytheciaceae by the straight erect © 
capsule, absence of cilia, short basal membrane, capsule not con- 
tracted under the mouth when dry. ; 
Homalothecium and certain species of Brachythecium (notably 
B. acuminatum) have the capsule characters of this family, but 
their other characters show their relationship to be with the 
Brachytheciaceae. 
Key to the Genera. 
Leaves veined, vein single, extending to the middle of the leaf or beyond. 
4. CLIMACIUM. 
Leaves veinless or the veins short and double, 
Alar cells not quadrate, 
Alar cells quadrate. 
Complanate foliate (except Z. repens and E. seductrix) with very large 
persistent annulus (except 2. Drummondii). 
1. ENTODON ( Cylindrothecium). 
Leaves more or less falcate-secund especially at the tips of branches; annulus 
narrow, 2. PYLAISIELLA (/y/aisia). 
3. HOLMGRENIA ( Orthothecium). 
1. ENTODON. C. Muell. Linnaea, 18: 704. 1844. Also Bot. 
Zeit. 1894: 740. 
(Cytinprotuecium Br. & Sch. Bry. Eur. fasc. 46 and 47. pi. 
464, 465. 1851.) 
Leaves obtuse, quadrate; alar cells of 2 or 3 layers. 
Leaves acute or acuminate, quadrate, alar cells of one layer. 
Leaves gradually narrowly acuminate; segments of endostome adhering to the 
teeth. 8- E£. brevisetus. 
7. E, orthocarpus. 
Leaves acute to apiculate ; segments free. 
Teeth conspicuously hyaline margined. - 6, E. repens. 
‘Teeth not conspicuously hyaline margined. :, 
Annulus apparently none ; seta yellow. age Drummondit, 
Annulus of narrow small cells; seta red, 2, E. seductrix. 
Annulus large, of large cells. 
Teeth uniformly papillose-roughened. 3. £. compressus. 
Teeth conspicuously striolate above ; leaves serrate. — 
4, Sullivantii. 
Teeth not conspicuously striolate ; eaves nearly entire. 
ie B. roc atieanntatie 
