Hypnace^.] 2 [Thuidium. 



tropical genus, as e.g. Pterygophyllum, Thuidium, Hypnum micans, demissum, &c., 

 and these foreign allies often help us much in understanding our familiar 

 friends. 



Subf. I. LESKEE^. Primary stem creeping, with decumbent 

 branches, and the primary branches forming secondary stems, pinnate or 

 vaguely branched, often with paraphyllia. Leaves patent or secund with a 

 stout single nerve, opake, papillose : cells incrassate, minute and rounded 

 above, hexagono-rectangular or elongated at base. Capsule oblique and 

 curved, or erect and symmetric, cilia none or rudimentary, sometimes 

 perfect. 



I. THUIDIUM Br.Sch. 



Bry. eur. fasc. 49 — 51 (1852). 



Primary stem but little divided, prostrate, densely radiculose, or 

 erect with few radicles, pinnate, bi- or tri-pinnate. . Stem leaves larger, 

 decurrent, cordate-triangular, acuminate, papillose on one or both sides; 

 paraphyllia numerous, polymorphous. Branch leaves small, ovato- 

 lanceolate, the cells minute, rounded-hexagonal, the basal oblong- 

 quadrate. Capsule oblong, cylindraceous, subarcuate ; teeth of 

 peristome long, densely articulate, endostome with 3 — 4 cilia. 

 Terrestrial. — Der. Thuia, the arbor-vitse tree, «8os likeness. 



A lovely genus of mosses including some 140 species, all remarkable for 

 their flat feather-like mode of growth. Some of the species approach each 

 other closely, and we are much indebted to Lindberg's acumen in detecting 

 the difference in the points of the ramuline leaves, and the perichaetial bracts 

 when present afford valuable characters. 



Clavis to the Species. 



Stem tripinnate, apical cell of ramuline leaves conic, smooth. tamariscifoUum. 



bipinnate, apical cell truncate, papillose. 



Ap. cell deeply notched, papillae spiniform. recogniium. 



with shallow notch, pap. short, forked. delicatulum. 



pinnate, erect. 



Dioicous ; inhabiting dry banks. 



Cells of branch-leaves roundish. abietinum. 



. •: 7~ longish oval. hystricosum. 



Autoicous ; mhabitmg bogs. Blandowii. 



Sect. I. EUTHUIDIUML^WS. Stems prostrate, trailing, bi-tripinnate, 

 the branches arranged in a single row on each side of stem. 



I. THUIDIUM TAMARISCIFOLIUM [Neck.) Lindb. 



Dioicous; stems long and trailing, tripinnate. Cauline leaves 

 deltoid-cordate at base, suddenly lanceolate, crenulate at margin. 



