362 BRYACE^. [Hypnum. 



articulations ; cilia 2 or 3, long, appendiculate. Annulus nar- 

 row. — Thaninium^ Schimi). 



95. H. Alleglianiense, Muell. Plants green : leaves of 

 the branches and branchlets erect-spreading, oblong-elliptical, 

 broad and shoit-i^ointed, the pericha)tial erect, narrowly acumi- 

 nate, ecostate : flowers syncecious and nioncecious : capsule 

 short-pedicelled, with a broad orifice ; annulus simple. — Syn. 

 ii. 502 ; Sulliv. Mosses of U. States, 69, and Icon. Muse. 161, 

 t. 103. II. neckeroides, Hook. & Wils. in Drumm. Muse. Amer. 

 (Coll. II.), n. 119. Tkamniimi Alleghaniense, Bruch & Schimp. 

 Bryol. Eur. llLamnium, 4. 



Hab. Kooky and shady banks; Pennsylvania, Ohio, Arkansas; St. 

 Louis (Dniintnond). Though not common, it is widely distributed, most- 

 ly in tlie plains, along rocky limestone creeks. 



96. H. neckeroides, Hook. Differs from the last in the 

 broad sheatlung acuminate and reflexed pericha^tial leaves, and 

 the dioecious inflorescence. — Muse. Exot. t. 58. II. JVeckera, 

 Schwaegr. Suppl. iii. 2, t. 288. Thamnium neckeroides^ Bruch 

 & Schimp. 1. c. 



Hab. Northwest coast [Menzies). 



97. H. Bigelovii, Sulliv. Dioecious: branchlets flat : leaves 

 bright green, shining and striate when dry, two-ranked, spread- 

 ing, oblong-acuminate, flat and serrate at the apex, the borders 

 inflexed on one side ; areolation parenchymatose ; perichoetial 

 leaves lanceolate, linear-acuminate, serrate above, costate : cap- 

 sule oval, distinctly necked ; pedicel thick, arcuate above ; 

 inner membrane very large ; cilia two, appendiculate ; annulus 

 large, compound. — Pacif. R. Rep. iv. 189, t. 9. 



Hab. Valleys of the Coast Ranges, and mountains of California 

 [Bigeloio, Bolander). 



Subgenus XV. PLAGIOTHECIUM. (PI. 6.) 

 Plants partly prostrate, irregularly branching and ramulose, 

 stoloniferous, rooting, soft and variable in size. Leaves thin, 

 glossy, mostly entire ; costa none, or double, very short and 

 thin ; areolation long and narrowly rhomboidal-hexagonal, 

 larger at the base, sparingly chlorojohyllose. Flowers monoe- 

 cious, rarely dioecious ; perichaetium sheathing, radiculose at 

 base J vaginule smooth. Calyptra very narrow, fugacious. 



