— 45 — 



Fam. 12. ThuidiacesB. 



41. Myurella Bryol. eur. 



A. Leaves densely crowded not acuminate, soon becoming 

 whitish green. Perichetial leaves subulate-acuminate r. with 

 filiform point. Capsule with very short or indistinct neck. 

 l.M.julacea Villars. — Hypnum VilL; Myurella Br. eur. 



Leaves round-ovate obtuse faintly denticulate us. not strongly 

 papillose, r. with short filiform point. Capsule suboblong; 

 cilia short; lid conic. Tufts sparingly, gen. only at base, radi- 

 eulose. R. fruiting. — On rocks or on base of trees. Eur. 

 not r. Sweden, Norway, Switzerl.! Anier. r. Can.; Macoun. 

 * M.grapillima Kindb. n. subsp. — M. julacea var. gracilis 

 Kindb. Laubm. Schwed. u. Norw. 



Leaves, at least the upper, acute with filiform point, smaller 

 than in our other species. Tufts compact densely radiculose also 

 above. Capsules unknown. — - Alp. rocks r. Eur. Norway near 

 Kongsvold! 



B. Leaves distant acuminate filiform-pointed; perichetial also 

 with filiform point. Capsule distinctly necked. R. fruiting. 

 2.M.teneri'iina Bridel. — Pterigynandrum Brid. 1819; Myu- 

 rella Lindb.; M. apiculata (Hueb.) Br. eur. 



Leaves slightly papillose faintly denticulate not much distant, 

 subovate nearly gradual^ acuminate. Capsule obovate; cilia 

 long; lid conic. — Alp. rocks r. Eur. Norwayl >->Amer.»: Berg- 

 gren; Lesq. et Jam. 



S.M.gracilis Weinmann. — Hypnum Wm. 1845; Myurella 

 Lindb.; M. Careyana Sulliv. ic. m. 



Leaves very papillose coarsely dentate or fimbriate gen. much 

 distant, broad-ovate abruptly acuminate. Capsule thick piri- 

 form; cilia sometimes short; lid obtuse. — Limestone rocks. 

 Eur. r. Austria; Breidler, com. Warnstorf. Amer. less r. Can.: 

 Macoun; Moser; Waghorne. 



42. Heterocladium Bryol. eur. 



A. Leaves distinctly dimorphous. Stem with paraphyllia. 



a. Leaves smooth, r. mamillose at apex. 

 l.H.procurreus Mitten. — Pterogonium Mitt.; Heterocladium 

 Kindb.; Macoun Canad. musci n. 498; Hypnum, subg. Hetero- 

 cladium, Lesq. et Jam.; Heterocladium aberrans Ren. et Card. 



Leaves denticulate all ai-ound, not distinctly recurved, distant, 

 spreading when dry; costa double. Stem-leaves from ovate 

 base gi-adually tapering to a long filiform or subulate point, 



