ORTHOTRICHIEI. 219 



much crisped when dry as in Z. lapponicus, from which it 

 differs, moreover, in its longer fruitstalk and beak. 



This and Z. lapponicus constitute Schimper's genus Am- 

 phoridium, characterized by the short fruitstalk and crispate 

 leaves. Z. Mougeotii, however, possesses neither character 

 in a remarkable degree, and clearly connects Z. viridissimus 

 with Z. lapponicus. 



5. Z. lapponicus, Br. fy Schimp. ; monoicous ; tufted ; leaves 

 spreading, crisped when dry, lineari-lanceolate, keeled ; nerve 

 ceasing below the tip ; fruitstalk immersed ; sporangium tur- 

 binate, urceolate when dry, 8-striate ; beak short. — Hook, fy 

 Wils. t. vi. ; Eng. Bot. t. 2216. ; (Plate 20, fig. 3) ; Moug. fy 

 Nest. n. 309. 



In the crevices of alpine rocks. Bearing fruit in summer. 



Forming little loose or compact tufts. Stem ^-2 inches 

 long, a little tomentose ; leaves strongly crisped when dry ; 

 leaf-cells extremely small, while those of Z. Mougeotii are far 

 smaller than in Z. viridissimus. 



6. Z. gracilis, Wils. mss. ; tufted ; leaves strongly keeled, 

 suberect, nearly straight when dry, pellucid, strongly toothed 

 above ; nerve vanishing below the tip ; leaf-cells rather large. 



On walls. Malham. W. Wilson. Fruit unknown. 



Tufted, from 1 to 2 inches high, radiculose. Leaves oblong, 

 acute, strong and irregularly toothed ; leaf-cells punctiform 

 above, oblong below. 



Okdee XXII. OBTROTBICRIJEI, Br. & Schimp. 



Sporangium equal, mostly striated ; veil mitriform, cam- 

 panulate, plicate, generally covered with erect hairs; peri- 

 stome variable; leaves keeled; margin often involute; cells 

 punctiform, papillate. 



