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long hyaline ascending higher at margins than the others; 

 costa U8. excurrent. 



VI. Tortula. Leaves sometimes reflexed or limbate, gen. 

 sublingulate or sublinear, sometimes with hairpoint; basal cells 

 not higher ascending at margins. 



1. Cuneifolise. Leaves smooth not limbate without hair- 

 point, not or near base slightly reflexed; basal cells long. 

 Stem longish. Spores about 0,015 m. m. 



2. Limbatae. Leaves papillose limbate (by several cell- 

 rows, without hairpoint, not reflexed; basal cells long. Stem 

 very short Spores about 0,01 m. m. 



3. Mnralifornies. Leaves papillose reflexed to above middle, 

 sometimes limbate by one cell-row, often with hairpoint; basal 

 cells long. Spores about 0,01 m. m. Stem us. short. 



4. Ungniculatae. Leaves papillose not (or only by one 

 cell-row) limbate, without hairpoint, not or only below the 

 middle reflexed; basal cells sometimes short-rectangular. Spores 

 about 0,01 m. m. Stem often long. 



VII. En-Barbilla. Leaves not limbate, without hairpoint, gen. 

 from dilated base acuminate, us. reflexed and not large; cells 

 small us. short, the basal not higher ascending. Capsule small 

 us. oblong. Tufts us. -dense. 



1. Platyneuron. Leaves strongly revolute often nearly to 

 costa, entire and us. spirallj' twisted about stem, small and 

 us. brownish; costa thick. Perichetial leaves sometimes shea- 

 thing or subcon volute. Stem low. Dioecious. 



2. Streblotrichun). Leaves not or not strongly revolute, 

 not sheathing, r. denticulate. Perichetial leaves convolute. Pe- 

 dicel often yellow. 



3. Leptobarbttla. Upper (also perichetial) leaves sheathing 

 subconvolute not reflexed. Plants small. Dioecious. 



4. Pseudo-Didymodon. Leaves gen. (not strongly) reflexed, 

 r. denticulate; the perichetial not sheathing. Dioecious. 



a. Acutaeformes. Leaves (at least the perichetial) with 

 long-excurrent costa. 



b. Purpureaeformes. Leaves neither crisped nor curved, 

 small and us. red; costa gen. not excurrent. 



c. Fallaciforraes. Leaves curved us. crisped; costa not 

 excm-rent. Annulus of the capsule us. indistinct. Tufts gree- 

 nish or rufescent. 



d. Vinealiformes. Leaves curved and crisped; costa some- 



