POLYTR1CH1EI. 211 



minate. Hook. % mis. t. xi.; Eng. Bot. t. 1605, 1649, 

 1939.; (Plate 19, fig. 2) ; Moug. % Nest. n. 129. 



On heaths, moist banks, etc. Bearing fruit in winter. 



Forming loose patches. Stems short, innovated at the 

 apex ; leaves spreading, erect when dry, toothed on the margin 

 and back ; teeth of pcristome short. 



Varying in the length of the stem and fruitstalk, but always 

 distinguished from the last by its columella. Eng. Bot. 1. 1939, 

 is a variety with stems 2 inches or more long. 



3. P. urnigerum, Brid. ; stem branched ; leaves spreading, 

 imbricated when dry, linear-lanceolate from a sheathing base, 

 toothed; sporangium erect, subcylindrical ; lid convex, ros- 

 trate. Hook. $ Wils. t. xi. ; Eng. Bot. t. 1218.; (Moug. % 

 Nest. n. 28.) 



In mountainous woods, etc. Bearing fruit in winter and 

 early spring. 



Forming loose glaucous patches. Stems more or less 

 branched, fastigiate ; margin of lamellae thickened. Mr. 

 Wilson lays much stress upon the granulated surface of the 

 sporangium, but I find the surface of P. aloides even more 

 granulated. 



4. P. alpinum, Brid. ; csespitose ; leaves spreading, re- 

 curved, liueari-lanceolate from a sheathing base, concave, 

 sharply toothed, spinulose at the back ; sporangium more or 

 less inclined, swollen, ovate or oblong and curved, lid with a 

 long beak ; teeth short, irregular. Hook, fy Wils. t. xi. ; Eng. 

 Bot. t. 1905.; (Moug. % Nest. n. 219.) 



Stony ground in mountainous districts. Bearing fruit in 

 summer. 



Forming irregular tufts. Stems 2 or 3 inches long, branched 

 above, mostly decumbent at the base; leaves elongated; lamellae 

 thickened, but not so abruptly; leaf-cells elongated at the 



r 2 



