II YPN El. 75 



*** Leaves roundish, rather obtuse, entire, mostly two-nerved or nerveless. 



B. Stem erect, pinnate; fruitstalks from upper half of stem. 



* Leaves nerveless or two-nerved, entire. 

 ** Leaves nerved halfway. 



C. Stem erect, simply, doubly, or triply pinnate, tomentose or rough with 



paraphylla ; fruitstalks from upper part of stem. 



* Leaves papillose. 



** Leaves even, without papillae. 

 Sect. II. Leaves decidedly secund. 



A. Stem more or less erect, pinnate ; leaves falcato-secund. 



* Leaves nearly entire, nerve reaching halfway or more. 



** Leaves decidedly serrate, nerve reaching halfway or more. 

 *** Leaves more or less striate, nerveless or two-nerved, toothed. 



B. Stem procumbent, more or less pinnate ; fruit near the base. 



C. Leaves turned upwards, assurgent. 



Sect. III. Leaves decidedly complanate ; stems procumbent ; fruit radical. 



Sect. I. Leaves spreading in all directions.* 

 A. Stem creeping, irregularly branched, or occasionally arched 



and pinnate. 

 * Leaves acute, nerve reaching at least lialfivay.^ 



t Leaves plicate. 

 a. CAMPTOTIIECIUM, Schimper.$ 



1 . H. lutescens, Dill., Huds. ; stem prostrate or ascending, 

 variously branched ; branches erect or depressed ; leaves lan- 

 ceolate, plicate, minutely toothed above, nerve reaching above 

 the middle; sporangium cernuous; fruitstalk rough; lid co- 

 nical, shortly beaked. Hook. Wils. t. xxv. ; Eng. Bot. /. 

 1301. ; (Plate 5, fig. 2) ; Moug. % Nest. n. 334. 



On calcareous rocks, on the borders of woods, in old stone- 

 pits, and on sandy banks, especially near the sea. Common. 

 Bearing fruit in spring. 



Monoicous; forming dense, yellow or tawny, shining tufts; 



* In Hypnum depressum the leaves are flattened, as in the last section, 

 f Habit of Brachythecium, leaf-cells of Hypnum, Schimper. 

 J In H. demissum and depressum the leaves are either nerveless or have two 

 faint nerves. 



