Hypnace^.J 171 \Isopterygium. 



nerveless, .entire ; cells narrow, linear, shorter and brown at base, longer 

 at angles. Perich. bracts sheathing, ovate, acuminate in a flexuose subula ; 

 seta reddish ; capsule erect, oblong, elongated, brown ; lid conic, rostellate ; 

 teeth lanceolate-subulate, yellowish, processes as long, cilia rudimentary. 

 Hab. — Wet places in mountains, not rare. Fr. 9. , 



Near Inverary w. fr. {Rev. C. Smith). Finlarig burn c. fr. (JVilson) ! ! Ben Laoigh and 

 near Tyndrum c. fr. {Ewing 1882) 1 1 Ben Bulben, Sligo. Malham {Wood 1868). Glen 

 Dole c. fr. (Fergusson) ! 1 Kilblane c. fr. 



An elegant moss, conspicuous by the glossy purplish leaves, rare in fruit.. 

 Much more robust than the last species, with which it agrees closely in structure. 



21. ISOPTERYGIUM Mitt. 



Journ. Linn. Soc. xii, 21 (1869). 



Stem procumbent, extended, the branches of unequal length, fasciculate. 

 Leaves compressed, distichous, the three upper series (the central and 

 intermediate) scarce evident, the three under wanting ; nerves two, very 

 short ; cells narrow, smooth, the basal angular not differing) or sometimes 

 enlarged and quadrate. Capsule inclined or horizontal, oblong, not sulcate, 

 cilia united into one. — Der. t<ros equal, and irripv^ a wing. 



A genus of about 140 species, mostly of small size, and usually combined 

 with Plagiothecium, from which it is difficult to distinguish it ; the importaut dis- 

 tinction lies in the difference in the phyllotaxis. 



Clavis to the Species. 



Leaves with enlarged angular cells, plants robust. pratense. 



without distinct angular cells, complanate. 



Cells very long and narrow. 



Flagelliferous. Leaves entire. Muelleri. 



Ramuliferous. serrulate at point. elegans. 



shorter and wider. 



Leaves complanate, short-pointed. depressum. 



spreading, secund. 



Leaves entire, acuminate. pulchellum. 

 with long serrulate acumen. repens. 



I. ISOPTEEYGIUM PRATENSE (Koch) Lindb. 



Dioicous ; suberect, with few irregular branches. Leaves complanate, 

 the upper secund, ovato-lanceolate, nerveless. Capsule ovate, curved, 

 cernuous ; lid conical. (T. CXV, F.) 



Syn. — Hypnum pratense Koch in Brid. Bry. univ. ii, 769 mem. (1827). Br. Sch. Bry. Eur. fasc. 

 57 — 6l, p. 43, t. 29 (1854). ScHiMp. Synops. 628 (i860), 2 ed. 759. Wils. Bry. Brit. 399, 

 excl. var. (1855). Berk. Handb. Br. m. 125 (1863). Milde Bry. Siles. 363 (1869). Lesq. 

 James Moss. N. Amer. 397 (1884). BouL. Muse. Fr. 36 (1884). HusN. Muse. gall. 406, 

 t. 117 (1894). LiMPR. in Rabenh. D. kr. fl. Laubi^. iii, 501 (1899). 



Hypuum amuenum Hook, in Drumm. Muse. amer. No. 196 p.p. 



Hypnum curvifoUum v&t. pratense Rabenh. D. kr. fl. II, s. 3, 273 (1848). 



