86 
7. THUIDIUM ABIETINUM (L.)’Br. & Sch. 
flypnum abietinum L. Sp. Pl. ed. 2, 1591. 1763. 
Hynum Stereodon abietinus Brid. Bryol. Univ. 2: 573. 1827. 
Thuidium abtetinum Br. & Sch. Bryol. Eu. fasc. 49-51. 1852. 
Plants rather large, densely caespitose, yellow-green above, 
darker below; stem 5 to 9 cm. long, ascending-erect, rigid, 
simple or divided, closely pinnately branched; branches simple, un- 
equal, attenuate, spreading or recurved, terete when dry; para- 
phyllia multiform, mostly linear; stem-leaves broadly ovate, acu- 
minate, deeply biplicate, margins papillate-serrulate, plane or re- 
curved, costate to the base of the acumen, appressed when dry; 
leafcells 2 rows, unipapillate, roundish, quadrate-hexagonal and 
very small at basal margins, oval-rhombic and much larger above ; 
branch-leaves similar but smaller, apical cell with usually two 
papillae, sometimes only one. Dioicous; perichetial bracts mostly 
entire; capsule narrowly cylindrical, suberect, curved, strumose ; 
annulus compound; segments widely open, papillate-striate ; cilia 
I to 3, uspally imperfect; operculum long-conical, acute; spores. 
papillose, .o12 to .016 mm., maturing in spring. 
On rocks, stones and the ground, in dry sterile places. Com- 
mon in Europe and North America, from Greenland to Virginia. 
(E. G. Britton), and from Newfoundland (Waghorne) to British 
Columbia (Macoun.). Fruiting in Colorado (T. C. Porter) and in 
Montana (F. W. Anderson). Rare or absent in the Gulf States. 
and on the Pacific slope. 
Type locality European. 
Ittust. Hedw. Muse. frond. 4: p/. 32. 1791. Br. & Sch. 
Bryol. Eu. 5. p/. 485. 1852. Husnot, Musc. Gall. p/. 88. 1894- 
Exsic. Drumm. Musc. Bor. Am. no. 216. Aust. Musc. App. 
no. 304. Macoun, Can. Muse. no. 273. 
8. THurpium Vireintanum (Brid.) Lindb. 
fTypnum Stereodon Virginianus Brid. Bryol. Univ. 2: 276. 1827. 
Thuidium Virginianus Lindb. Musc. Scand. 36. 1868. Besch. 
Prodr. Bryol. Mex. 91. 1871. 
Hypnum gracile Lancastriense L.. & J. Mosses N. A. 324. 1884. 
Thuidium punctulatum De Not. Erbar. Critt. Ital. no. 909. 
1863. et. Epil. 234. 1869. Limpr. Rab. Kryptfl. 4: 3, 825. 1895. 
Plants small, dark or dirty green, intricately caespitose; stem’ 
2-4cm. long, creeping, pinnately branched; branches simple, erect- __ 
