88 
or oblong-cylindrical, horizontal, curved ; annulus compound; cilia 
2to 4; operculum mammilate to short conical, acute or obtuse; 
spores, .008-.012 mm., rough, maturing in summer. 
On rotton wood, base of trees, stones and the ground. Canada, 
Manitoba and Vancouver's Island, southward, through the United 
States, east of the Rocky Mountains, to New Mexico. (Bigelow.) 
Type from Jamaica, Swartz, in Herb. Boissier. ! 
Ittust.: Hedw. Spec. Muse. pi. 69. figs. 1-5. 1801. Sull. Icon. 
Muse. 156. p/. roo. 1864. 
Exsic.: Drumm. Musc. Bor. Am. no. 217; ed. 2, nos. 140-141. 
Sull. Musc. All. no. 5. Sull. & Lesq. Musc. Bor. Am. ed. I, no. 
277; ed. 2,no. 410. Aust. Musc. App. no. 298. 
Rem. Quite variable, yet easily distinguished by its characters. 
Var. Ravenellii S. & L. is one of many involute forms growing 
on stones and in the sand in South Carolina and Florida. 
ga. THUIDIUM MICROPHYLLUM LIGNICOLUM (Kindb.). 
Thuidium lignicola Kindb. Ott. Nat. 4: 63. 1890. 
Plants larger, often rufescent, leaves broader, margins more or 
less recurved; leaf-cells more uniformly rhombic or rhomboidal; 
capsules usually shorter and more turgid. 
From Ohio northward to Canada and westward to Vancouver’s 
Island, with the type and scarcely separable from it ! 
HETEROTHUIDIUM: Stem leaves and branch leaves simi- | 
lar, smooth or more strongly papillate on lower surface; leaf cells 
oblong: linear to narrowly rhomboidal; paraphyllia dense, filamen- 
tous. 
10. THurpium BLaxnpowi (W. & M.) Br. & Sch. 
Hypnum Blandowti Web. &. Mohr, Bot. Tasch. 332. 1807. 
Hypnum abietinum var. paludosum Wahl. F1. Suec. 698. 1826. 
Hypnum laricinum Wils. Eng. Bot. Suppl. 2: pl. 2760. 1832. 
Thuidium Blandowu Br. & Sch. Bryol. Eu. fasc. 49-51: 10. 
1852. * 
Plants of /arge size, densely caespitose, yellow-green above, 
darker below; stem 5 to 10 cm., long, erect, rigid, simple or di- 
vided, closely pinnately branched; branches simple, spreading or 
recurved; paraphyllia very numerous, tomentose, from an: od/ong- 
linear rufescent base, long-filamentous; stem-leaves soft, ovate-tri- 
angular, narrowly acuminate, deeply concave, sulcate, abruptly 
