474 HYPNACE^. 



divisions, which are usually very slightly, often fastigiately , 

 hardly f innately branched, forming large tufts or mats of a pale 

 or yellowish lurid green, shining, very pale and glossy at the tips 

 of the stems and branches. Leaves very large for this Section, 

 1-1% lines long, not crowded, more or less regularly imbricated 

 in two rows, spreading and complanate in the lower part, so as to 

 render the stems very broad and flattened (less usually falcato- 

 secund and decurved from the base, so that the stems are 

 narrower, not complanate) ; strongly hooked at the tips of the 

 stems ; very smooth and glossy at back when dry, sometimes 

 slightly rugose ; widely ovate-oblong, somewhat narrowed and 

 decurrent at extreme base, above tapering to a rather long, but 

 very broad, not slender acumen, which is flat, not channelled, 

 abruptly pointed or even sub-obtuse ; margin plane, entire except 

 at extreme apex which is sub-denticulate, nerve double, one 

 branch longer than the other, or none ; cells longer than in H. 

 cupressiforme , very narrow ; at basal angles laxer, then rather 

 abruptly large, thin-walled, hyaline, forming conspicuous 

 decurrent hyaline auricles. Dioicous. 



Hab. On the ground in woods, rocks covered with earth, etc., principally on 

 clay. Not common. Fr. very rare, not found in Britain ; summer. 



This plant is described in the Bryologia Britannica as a variety of H. pratense 

 Koch, and it differs so little from that plant that it is somewhat doubtful whether it 

 will not have to be ultimately re-united with it. In that species the leaves, usually at 

 least, are less hamate, only slightly decurved, so that the branches are very flattened 

 and hardly hooked above ; and the auricular cells are less distinct ; but these 

 characters are certainly inconstant. The robust habit, very wide stems (taken with 

 the leaves) and large leaves with wide, not tapering acumens and large hyaline 

 angular cells, abundantly separate our plant from all forms of H. cupressiforme or its 

 allies ; indeed slender forms with the leaves less complanate and less tapering are 

 more likely to be taken for robust plants of H. ochraceum. 



19. Hypnum revolutum Lindb. (Stereodon revolutus Mitt. ; 

 Hypnum Heufleri Juratz., Schp. Syn.) (Tab. LVIII. G.). 



Resembles slender forms of H. molluscum, more or less 

 pinnate, often regularly so, 1-3 inches long, small ; yellowish 

 green or brownish. Leaves crowded, falcato-secund or hamate, 

 small, §-§ line long, oblong-lanceolate, gradually tapering from 

 near the base to a narrow acute acumen, concave, plicato-striate , 

 especially when dry, entire or sub-denticulate at point, margin 

 strongly revolute from the base to high in the acumen ; nerve 

 double or obsolete ; cells short, thin-walled, 8-10 times as long 

 as broad, resembling those of H. incurvatum, at angles rather 

 numerous, quadrate, small, rather opaque, forming small, rather 

 clearly defined but not very conspicuous auricles. Dioicous. 



