322 BRYACE^. [H2jpnum. 



base and quadrate on the borders. Flowers monoecious or 

 dioecious ; perichaetium long, imbricate. CalyjDtra covering the 

 capsule to the middle or lower. Capsule long-pedicellate, 

 narrowly ovate or cylindrical, incurved or arcuate. Operculum 

 conical, or more or less long-rostrate. — T/midhcm, Schimp. 



* Plants minute, doubly jnnnate : areolation round-hexagonal 

 and uniform: cap side horizontal ; lid subulate-rostrate : flow- 

 ers monoecious. 



6. H. minutulum, Hedw. Stem papillose-tomentose, ir- 

 regularly divided ; branches pinnately ramulose : stem-leaves 

 more distant, deltoid, acuminate or aj^iculate, opaque, subrevo- 

 lute on the borders ; costa stout, vanishing near the apex ; 

 branch-leaves ovate-acuminate, concave, with shorter costa; 

 leaves and paraphyllia very papillose ; pericliEetial leaves thinner, 

 nearly smooth, the inner lanceolate-acuminate, with the long 

 acumen more or less reflexed : capsule ovate-oblong, cernuous 

 or horizontal, on a long smooth pedicel, dark yellow, brown 

 when old ; annulus large, compound. — Muse. Frond, iv. 90, t. 34. 

 Thuidium minutulum, Bruch & Schimp. Bryol. Eur. t. 481. 



Hab. Decaying trunks and roots of trees, in woods. 



7. H. pygmaeum, Sulliv. & Lesq. Plants dirty green; 

 stem bipinnate, papillose ; branches and branchlets short, very 

 slender : stem-leaves much larger, distant, broadly deltoid, long 

 and narrowly acuminate, subdecurrent, spreading ; branch-leaves 

 ovate-lanceolate, open-erect, opaque, densely papillose and pa- 

 pillose-crenulate on the borders ; costa stout, pellucid, vanisliing 

 below the apex ; paraphyllia very few or none ; perichjetial 

 leaves nearly smooth, with a long loose areolation, the inner 

 sheathing, all erect, lanceolate, narrowly acuminate, costate, 

 slightly serrulate above: capsule long-pedicellate, oblong, ar- 

 cuate, unequilateral, broad-mouthed ; teeth flcxuous, filiform at 

 the apex ; segments as long as the teeth ; cilia three, short ; 

 annulus large. — Mosses of U. States, 67, and Icon. Muse. 153, 

 t. 98. Thuidium pygmceum, Bruch & Schimp. Bryol. Eur. 

 Thuidium, 6. 



IlAB. Limestone rocks, in thin close mats, in shaded ravines, Central 

 Ohio; rare. 



Distinct from the last in its smaller size, papillose stems, bipinnate 

 ramification, narrower branch-leaves, and the absence of paraphyllia. 



