BRYE1. 183 



and the sharpness of the serratures. Sometimes in very alpine 

 situations the serratures disappear. Mnium insigne, Mitten, 

 is considered by Schimper as a long-leaved variety. 



2. M. cuspidatum, Iledw. ; synoicous ; stem erect, sim- 

 ple ; lower leaves obovato-acuminate, upper leaves ovato-lan- 

 ceolate ; sporangium subpendulous, ovate ; lid convex, obtuse. 

 Hook. $ Wils. t. xxxi. ; Eng. Bot. t. 1474. ; (Plate 17, fig. 3) ; 

 Moug. fy Nest, n. 621. 



On shady rocks and walls, especially in calcareous districts. 

 Bearing fruit in spring. 



Stems simple, with creeping or suberect stolons, very tomen- 

 tose below. Lower leaves distant, broadly ovate-acuminate ; 

 upper more elongated, crisp when dry ; margin cartilaginous, 

 toothed; nerve ceasing at or just below the tip; sporangium 

 solitary ; lid mostly obtuse. 



The synoicous inflorescence is the most certain distinctive 

 mark, taken in conjunction with the size and broad solitary 

 sporangia and the blunt lid. The leaf-cells moreover are not 

 half the size, and very different. 



3. M. undulatum, Hedw. ; dioicous; stem dendroid, with 

 flagelliform arched branches and creeping stolons ; leaves more 

 or less ligulate, undulated, decurrent ; margin broad but thin, 

 simply toothed from the base ; sporangia aggregate, oval-ob- 

 long, pendulous ; lid convex, apiculate. Hook. Sf Wils. t. xxx. ; 

 Eng. Bot. t. 1449; (Plate 17, fig. 4) ; Moug. $ Nest. n. 420. 



Woods, shady banks, etc. Fruiting, but rarely, in spring. 



Forming extensive green patches. Stolons ascending, pen- 

 dulous above; stems erect, simple, or branched above, and 

 dendroid with curved flagelliform branches ; leaves spreading, 

 decurrent, variable in length, oval- oblong or strap-shaped, un- 

 dulated, obtuse, crisped when dry; margin narrow, toothed ; 

 nerve ceasing below the tip or subexcurrent ; leaf-cells like 



