﻿228 Grout : A Revision of the 



Hyp 



iphy 



tween the other species of that genus, but it is closer than the 



H. 



author. 



BRYHNIA Kaurin Bot. Not 1892: 60. 1892. 



(Named for the discoverer of the European representative of 

 the genus, Dr. Nils Bryhn.) 



Gamctophytc medium sized, in intricate mats or cushions, brig 



ht 



yellowish green on the surface, dirty brownish green below. Stems 

 creeping, irregularly divided and branching ; central strand present. 

 Leaves concave, serrate, decurrent, conspicuously papillose on the 

 lower surface by the greatly thickened angles of the cell walls ; 

 median leaf-cells short, 4-6:1, rather thick-walled; basal and alar 

 cells a little larger and more nearly rectangular. Sporophytc much 

 as in Bracliytliecium. Seta rough, twisted to the right ; capsule 

 short-oblong, somewhat arcuate ; operculum long-conic to sub- 

 rostellate ; annulus present, well developed ; cilia one or two, well 

 developed, nodose. 



The two species which we have referred to this genus (pre- 

 viously known as Eurhynchium Sullivantii and BracliytJicciurn No- 

 vac-Aiigliac) are undoubtedly very closely related and congeneric 

 but the question of their further relationship is more difficult. 

 They are seemingly intermediate between Bracliytliecium and Eu- 

 rhynchium and were so regarded by the author of this genus. Limp- 

 richt admits the genus under protest and says that in his opinion 

 the European representative belongs to BrachytJiccium. On the 

 other hand, there has been an increasing tendency to refer the 

 American representatives to Eurhynchium. The shortness of the 

 leaf-cells is a character that does not pertain to BrachytheciuM 

 (except in the anomalous B. rcflexum and B. cyrtophyttum)* The 

 thickening of the angles of the cell walls to form papillae occurs 

 in no species of BracJiytliccium and is much more strongly marked 

 than in any other species referred to Eurhynchium. The sporo- 

 phyte does not differ from that of Brachytheciutn except, perhaps, 

 by the longer pointed operculum, but the operculum is far shorter 

 than in Eurhynchium. On the whole, therefore, it seems more sat- 

 isfactory to constitute a separate genus of these species. 



