PTERYGOPHYLLUM. 365. 



1. Pterygophyllum lucens Brid. (Hypnum lucens L.) 

 (Tab. XLIX. H.). 



In irregular patches, pale, glaucous or bright green, glossy; 

 stems procumbent, irregularly branched. Leaves rather closely 

 imbricated, complanate, when dry little altered, large, widely 

 oval, obtuse, entire, nerveless; cells very large, hexagonal, 2-3 

 times as long as broad, 50-60 /* in diameter, thin-walled, the 

 marginal hardly distinct. Seta and capsule reddish, succulent. 

 Seta smooth, ^-1 nich high ; capsule horizontal or sub-pendulous, 

 short, oval ; lid long-beaked ; peristome red. Autoicous. 



Hab. Sandy ground, stones, etc., in moist situations; frequent, especially in 

 sub-alpine districts. Fr. late summer. 



A very beautiful and distinct plant, not likely to be mistaken for any other ; the 

 large, obtuse, complanate leaves, not undulate, nerveless, and laxly areolate are quite 

 different from those of any other species. The cells are so large as to be quite visible 

 with the lens. The seta is of a remarkably thick and succulent texture. 



Order XXIII. LEUCODONTACE^. 



Stems irregularly brancRed, not pinnate. Leaves in several 

 rows ; areolation short, rounded-oval, smooth. Nerve single, 

 double, or absent. Capsule symmetrical. Peristome double, 

 rarely single. Calyptra cucullate. Seta smooth. 



The genera united under this Order agree in the areolation of 

 their leaves, short and often rounded or oval at least in the upper 

 half, and smooth, not papillose ; thus differing from the Ortho- 

 theciaceae and Hypnaceae on the one hand and from the 

 Leskeaceae on the other. From the Neckeraceae they differ 

 in the non-complanate leaves and different areolation, from 

 Cryphaeaceae in the cucullate calyptra and exserted capsule, from 

 Hookeriaceae in the cucullate calyptra and very different cells. 



87. LEUOODON Schwgr. 



Secondary stems erect or arcuate, moderately robust. Leaves 

 closely imbricated, rendering the branches julaceous when dry ; 

 longitudinally plicate, nerveless. Upper areolation elliptic. 

 Perichsetial bracts long, sheathing. Seta long ; annulus present ; 

 peristome single, teeth irregular, short, fugacious. Calyptra 

 reaching to the base of the capsule. 



