412 HYPNACE/E. 



Owing, doubtless, in part to their somewhat amplexicaul insertion, the leaves are 

 with some difficulty detached from the stems, which are consequently usually found 

 leafy, and not denuded, to the very base. Some of the forms it assumes are very 

 beautiful from their regularly plumose branching and bright, golden foliage. 



112. EURHYNOHIUM B. & S. (emend. Milde). 

 (Eurhynchium & Rhynchostegium B. &* S., Schp. Syn., &c). 



Mosses of varying habit, as in Brachythecium. Leaves more 

 or less erect and imbricated, not distinctly falcato-secund , rarely 

 complanate, single-nerved, or rarely almost nerveless. Cells 

 linear, rhomboid, or hexagonal-rhomboid, rarely less than five 

 times as long as broad. Seta smooth or papillose. Lid long- 

 beaked. Peristome perfect. 



This genus as here understood includes Rhynchostegium 

 B. & S., which is not marked by any satisfactory characters. It 

 differs from Brachythecium mainly in the rostrate lid, from 

 Plagiothecium in the leaves rarely complanate, and the lid always 

 long-beaked, the nerve single and usually long, though some 

 species are somewhat intermediate in their generic characters ; 

 from Amblystegium in the longer, narrower areolation, the rostrate 

 lid and frequently rough seta. 



/All the leaves narrow, lanceolate; plant very small and slender 2 



\Ls., at least the stem-Is., ovate-lanceolate, ovate, or oblong 5 



{Seta smooth (rarely rough); Is. almost setaceous, silky io. tenellum 

 Seta rough ; Is. with less fine acumen 3 



/Ls. broadly nerved almost to apex, dark green 9. Teesdalei 



•^\Nerve slender, ceasing about \ or £ up leaf 4 



{Dioicous; cells rather short, 4-6 times as long as wide 7. pumilum 

 Autoicous ; cells longer 8. curvisetum 



t Stem more or less bipinnate, with paraphyllia ; stem-Is. very decurrent, triangular, 

 5-! with long fine acumen (seta rough) ..5. prtslongum 



[Stem not bipinnate ; stem ls. less or not decurrent 6 



^-/Stem-Is. oblong, concave, suddenly and narrowly acuminate ; (seta rough) 7 



\ Stem-Is. more or less oval or triangular, not suddenly acuminate 9 



/Acumen rather short, nerve rather thick below .3. crassinervium 



' \ Acumen long, filiform , 8 



o/Stem usually pinnate, elongate; ls. green *. piliferum 



\ Stem irregularly branched ; ls. pale or yellowish ; (alpine) 1. cirrosum 



{ Branch-Is. (or some of them) sub-obtuse, closely imbricate when dry ; (seta 

 9-] smooth) IO 



[All the leaves acute, not imbricate 12 



{Ls. more or less elliptic, wide at apex 17. mutale 

 Ls. more or less ovate or lanceolate, narrow towards apex 11 



/Branches curved ; cells short 12. circinatum 



\ Branches short, not or scarcely curved ; cells long 13. strigosum 



C Stem-Is. cordate-triangular, with more or less distinct auricular cells ; (seta 



12 -! smooth) 13 



[Stem-Is. ovate, not cordate, angular cells not distinct 15 



