— 178 — 



n. Pseudo-Bruchia Kindb. 

 4.T.l)reTicollis Hoinschuch. 



Leaves concave subovate shovt-acuminate very small, nearly 

 appressed when dry; costa not or scarcely excurrent. Periche- 

 tial leaves ovate-oblong more distinctly acuminate. Peristomial 

 teeth red entire or faintly perfoi'ate. Stem very short. Tufts 

 small dark green. — Earth and rocks in alp. regions r. Eur. 

 Norway! Ainer. »Greenl. »: Berggren. 



88. Ditrichum Timm. 



A. Leaves sheathing; costa rough at back. 

 L Trichodon. Dioecious. 



B. Leaves not sheathing; costa smooth. Perichetial leaves 

 not (exc. D. vaginans and D. homomallum) sheathing. 



II. Sselania. Leaves carinate often covered with a glaucous 



meal. Monoecious. 



IIL Leptotrichum. Leaves not carinate. Often dioecious. 



1. Xanthopodia . Pedicel of capsule yellow. Leaves long- 

 subulate; costa long-excurrcnt. Monoecious or paroeeious. 



2. Erythropodia. Pedicel finally red Leaves often short- 

 subulate. Dioecious. 



I. Trichodon Schimper. 

 l.D.tenuifoliTim Schrader. — Trichostomiim Schrad.; Ditri- 

 chiim Lindberg; Trichodon cylindricus Schimper. 



Leaves abruptly narrovsred to a long subulate-setaceous den- 

 ticulate by the long-excurrent costa nearly filled point, curled 

 or patent when dry; cells narrow-rectangular. Capsule smooth 

 narrow-cylindric curved when young; teeth red papillose arti- 

 culate; pedicel long yellowish or pale red. Tufts low not to- 

 mentose. — Wet sand princ. in alps. Eur. Norway, Sweden, 

 Switzerl.! Austria: Breidler. Anier. Can.: Macoun. 

 2.D.oblongnm Lindberg. — Trichodon Lindb. in K. W. A. Foer- 

 handl. (Roy. Acad, in Stockholm) 1864; Ditrichum Kindb. 



Leaves abruptly narrowed to the entire or indistinctly den- 

 ticulate not long acumen, which in upper part is tilled by the 

 short-excurrent costa, not or faintly flexuous; cells short-rect- 

 angular at least the upper; pedicel red short; » peristomial teeth 

 pale brown hyaline smooth indistinctly articulates : Lindb. I.e. 

 Tufts dense but not tomentose, about 3 c. m. high when barren, 

 lower when fertile. — On earth in arctic districts r. Amer. 

 Greenl.: Berggren. Eur. Spetsbergen; R. Gyllencreutz. — The 

 barren specimens are resembling Ceratodon purpureus, but leaves 

 not are revolute; in fertile ones from Spetsbergen few capsules 

 are evolute (but unripe), their lids very short obtuse. 



