36 POLYTRICHACE/E. 



undulate, more sparingly and less sharply spinulose at back, with 

 smaller areolation ; the margin with smaller teeth, serrate only 

 in the upper half or with only a few very minute teeth below the 

 middle.; lamellae more numerous, 5-7, higher, in section each of 

 5 to 8 equal cells. Dioicous, male flowers cup-shaped, growing 

 on separate tufts of plants. Capsule nearly cect and only 

 slightly arcuate or almost straight ; narrower in proportion to its 

 length than in C. undulata. 



Hab. In similar situations, but much rarer. Sussex ; Perthshire ; Essex. Fr. 

 winter. 



C. angustata, though a distinct species, is separated rather by a combination of 

 characters, most of which may, at one time or another, be found to some extent in 

 C. undulata, than by any very clearly defined and obvious character ; apart from the 

 inflorescence, however, the character of the lamella? will usually serve to separate the 

 two species. In C. undulata they are few and short, so that when flattened out on 

 each side of the nerve, as by the pressure of a cover-glass, the space occupied by them 

 only amounts (in the upper half) to about -g- to T V of the total width of the leaf; 

 whereas In the present species they will be found to cover, under the same circum- 

 stances, \ and even J of the width ; the much weaker serration of the leaf margin is 

 also a distinguishing feature. The plant has, however, a distinct facies of its own, and 

 I have found it quite possible to distinguish it in the barren state, even from the 

 smaller forms of C. undulata with which it sometimes grows, and without the aid of a 

 lens, by the more lurid colour, and the more erect, less undulate leaves. The narrower 

 leaves, spinulose at back of lamina, will distinguish it from C. crispa. It is a much 

 commoner species in N. America than in Europe. Like C. undulata it varies very 

 considerably in length of capsule. 



3. Oatharinea crispa James (Atrichum crispum Sull., Schp. 

 Syn.) (Tab. IX, F.). 



In soft tufts, dull or yellowish green. Stems tall, erect, 

 simple, 2-4 inches high. Leaves distant, rather large, oval- 

 oblong or oblong-lanceolate, the lower shorter and broader, 

 patent, when dry crisped, hardly at all undulate, obtusely acumi- 

 nate ; nerve strong, reddish brown, vanishing in the apex, with a 

 few rather blunt teeth at back above ; border reddish, dentate 

 from near the base, teeth smaller than in C. undulata, less 

 frequently in pairs ; lamellas very low' and indistinct, 1-4, some- 

 what undulate on the margin and frequently interrupted, vanish- 

 ing in the lower half of the leaf, in section of / to j rather large 

 equal cells. Areolation larger than in any of the previous species, 

 elongate towards base and less chlorophyllose, the upper quad- 

 rate-hexagonal or rounded, smaller towards the margin, not 

 spinose at back. Dioicous ; male plants taller, in separate tufts. 

 Pedicels slender, often two or three together, somewhat flexuose ; 

 capsule erect or nearly so, slightly curved, narrowly obconical, 



