460 HYPNACEiE. 



This species, on account of its strongly-curved leaves, is more like several of the 

 following species than H. adtmcum, to which, however, it is more closely allied. It 

 •differs from that species also in the deeper colour, more glossy texture, wider nerve 

 and usually firmer cell-walls, and the auricular cells are less enlarged and conspicuous. 



The entire leaves, wider at the base, and more circinate, will separate it from H. 

 fluitans, the non-plicate leaves from H. uncinatum and H. fakatum, and the decurrent 

 auricles from the other species which might be mistaken for it. 



It is a less variable plant than the last, but has a very slender form analogous 

 to the var. gracikscens of that, and so like it as to be barely distinguishable except 

 perhaps by the stronger nerve. Very robust forms approach H. Wihoni, but the 

 leaves are closer, less flexuose when dry, the stems more pinnate, the cells longer. 



* Hypnum Wilsoni Schp. (Amblystegium Wilsoni Lindb. ; 

 H. Sendtneri var. Wihoni Schp., Syn.) (Tab. LVII. B.). 



Resembling H . Sendtneri in structural details, this plant is 

 much more robust, 6-12 inches long, usually of a deep yellowish 

 green or golden colour, the stems slightly divided and very 

 remotely pinnate, the leaves more distant, very large, \\-2\ lines 

 long, oblong-lanceolate, gradually tapering to a long filiform 

 acumen, falcate, giving a very robust appearance to the stems, 

 which are however really slender and flexuose ; nerve variable in 

 width (Renauld describes it as narrower, but I have always found 

 it as strong) ; cells rather wider, with thinner walls, the angular 

 fewer and less distinct, forming smaller auricles. 



Var. /?. hamatum Lindb. (H. aduncum var. hamatum Schp.; 

 H. hamifolium Schp., Syn.). 



Very robust, stems very regularly atid closely pinnate, more 

 rigid ; leaves beautifully and regularly circinate, very long, 

 especially in the acumen, more crowded. 



Hae. Bogs, wet sandy shores, etc., rare. The var. B very rare. Fr. very 

 .rare, summer. 



H. Wilsoni is too closely allied in all structural points to be separated from H. 

 Sendtneri, but its great difference in habit and the size of its parts seem to warrant its 

 retaining the rank of a sub-species. The nerve is somewhat variable, even in leaves 

 from the same plant, but is certainly normally stout, much more so than in H. 

 lycopodioides, which differs also, notably, in the plicate-rugose leaves, when dry. The 

 iasal cells are frequently very incrassate, and the walls, as frequently happens in such 

 <ases, are then strongly porose. 



The var. B is a very marked form, and altogether one of the most handsome of 

 the Hypna ; the branching is very different from that of the type, but there is 

 absolutely no difference in the structure of the leaves. It is sometimes quite 

 submerged, and is then frequently encrusted with calcareous deposit. 



9. Hypnum lycopodioides Schwgr. (Amblystegium lyco- 

 podioides De Not.) (Tab. LVII. C). 



Resembling the more robust forms of H. Sendtneri and H. 

 Wilsoni ; the stems with few divisions which are simple or very 



