THUIDIUM. 383 



attenuated, simple, close and regular, longer than in the last 

 species, the leaves less crowded, when dry divergent from the 

 branch at base, then incurved, so as to render the branches 

 somewhat catenulate, not terete, branches as well as stems 

 clothed with long paraphyllia ; leaves small, narrower, acuminate, 

 almost entire; areolation resembling that of the stem-leaves. 

 Setae long, slender, red, i£-2 inches, numerous, from the upper 

 part of the stem ; -capsule arcuate, oblong-cylindric, wider than in 

 the last ; lid conical, acuminate. Autoicous. 



Hab. Bogs and marshes. Very rare. England. Fr. summer. 



This fine species, which is frequently found in abundant fruit, has only been found 

 in two or three bogs in England , it is frequent in North America and some of the 

 more northern European countries. Its habitat alone is sufficient to separate it from 

 all the other species, besides which the simply pinnate stems distinguish it from all but 

 T. abietinum and T. decipiens. The latter is known by its falcate leaves, wide 

 angular cells, etc. , the former by the characters pointed out in the description of that 

 species. 



3. Thuidium decipiens De Not. (Hypnum Notarisii Boul., 

 nonnull. auct.) (Tab. LI. B.). 



Resembling very closely slender forms of Hypnum com- 

 mutatum, and only distinguishable with the aid of the microscope. 

 Secondary stems frequently forked or divided, the divisions 

 simply pinnate, with short, close, or irregularly placed branches, 

 which are often hooked at the apex, bright or yellowish green. 

 Stems rather slender, soft, fragile, clothed with short, multifld 

 paraphyllia and often with radicular tomentum. Stem-leaves 

 not crowded, spreading or sub-secund, not much appressed when 

 dry, widely deltoid and suddenly narrowed at base to the inser- 

 tion, tapering to a short, often fine acumen, slightly decurrent 

 and auriculate at base, strongly plicate, margin slightly revolute 

 at base, denticulate at the widest part of the base, almost entire 

 above, or denticulate; nerve strong, reaching nearly to apex; 

 upper cells linear-rhomboid and vermicular or elliptic -hexagonal, 

 variable in width, but usually rather wider than in the last 

 species, longer and narrower in the acumen, gradually becoming 

 shorter and wider towards the base; at basal angles larger, 

 lax, hyaline, irregularly hexagonal, forming more or less distinct, 

 often coloured auricles. Papillae not numerous, usually, as in the 

 last, from the upper end-walls of the cells. Branches slender, 

 short, the leaves spreading and secund or strongly falcato-secund, 

 ovate-lanceolate, more or less longly acuminate, finely denti- 

 culate ; cells shortly linear-vermicular, or narrowly elliptical, 



