The Sub-genus Harpidiurc 



The name Harpidium, the Latin for "hook," describes the 

 hooked leaves, the important character of the sub-genus. 



The spore-cases are borne on long smooth pedicels, they 

 are oblong-cylindrical, often arched, with short and conical 

 lids. The teeth are as in 

 the genus Hypnum. 



H. uncinatum. (a) and (6) Spore-cases with 

 Kds ; (c) spore-case without lid. 



H. uncinatum. (a) Vertical section 

 of peristome showing three annulus 

 cells on the right at the base of an 

 outer tooth, inner tooth on the left ; 

 (b) portion of peristome showing on 

 the right one outer tooth, on the left 

 two keeled inner teeth and four cilia 

 below three rows of annulus cells. 



There are numerous species. 

 In the "Kryptogamen Flora," of 

 1898, K. Gustav von Limpricht, 

 a prominent bryologist, devotes 

 about seven pages to a most intricate classification of the 

 sub-genus Harpidium. 



The Hooked Boat-hook Mosses, Hypnum (Harpidium) 

 uncinatum, Hedw. See Colour Plate III. 



Habit and habitat. In pale yellow- 

 green tufts, erect or drooping, on stones 

 bordering streams, or on shaded ground, 

 rarely on decayed wood, common and 

 variable in mountain regions. 



Name. The specific name, Latin un- 

 cinatum, hooked, refers to the character 

 of the leaves. 



Leaves. Long, lance-shaped, grooved 

 lengthwise, the taper-point spreading, 

 scythe-shaped or hooked ; apex minutely 

 serrate; vein thin; cells narrow, more en- 

 larged at the base, broader and rectangu- 

 lar at the angles, which are slightly hollow. 



Leaves at the base of the pedicel (perichaztial leaves). Very long, 



295 



H. uncinatum. Right side 

 from base of a leaf to show en- 

 larged cells in the angle. 



