— Wb 
Fam. 12. Thuidiacez. 
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. 
1.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- 
culose. R. fruiting. — On rocks or on base of trees. Eur. 
not r. Sweden, Norway, Switzerl.! Amer. r. Can.: Macoun. 
*M-gracillima 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.tenerrima Bridel. — Pterigynandrum Brid. 1819; Myu- 
rella Lindb.; M. apiculata (Hueb.) Br. eur. 
Leaves slightly papillose faintly denticulate not much distant, 
subovate nearly gradually acuminate. Capsule obovate; cilia 
long; lid conie. — Alp. rocks r. Eur. Norway! »Amer.»: Berg- 
gren; Lesq. et Jam. 
3.M.gracilis Weinmann. — Hypnum Wm. 1845; Myurella 
. Lindb; M. Careyana Sulliv. ie. 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. 
Bur. r. Austria: Breidler, com. Warnstorf. Amer. less r. Can.: 
Macoun; Moser; Waghorne. 
42. HMeterocladium Bryol. eur. 
A. Leaves distinctly dimorphous. Stem with paraphyllia. 
a. Leaves smooth, r. mamillose at apex. : 
1-H. proeurrens 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 around, not distinctly recurved, distant, 
Spreading when dry; costa double. Stem-leaves from ovate 
base gradually tapering to a long filiform or subulate point, 
