The Sub-genus Harpidiuir 



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 (b) Spore-cases with 

 lids ; (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. 



Hypnum (Harpidium} 



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 

 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 (perichcdial leaves}. Very long, 



295 



H. uncinatum. Right side 

 from base of a leaf to show en- 

 larged cells in the angle. 



