DicranacejE.] 159 [Dicranmn. 



Dioicous ; in soft lax silky pale green tufts, fuscous below, black at 

 base; stem arcuato — or geniculate — ascending, slender, dichotomous, 

 falcate at apex, sparingly radiculose. Leaves long, rather rigid, falcato- 

 secund, from a lanceolate base, longly capillaceo-subulate, subtubulose 

 above, nerve very broad, \ width of base, occupying all upper part of 

 leaf, serrate at back and margin, cells at base small narrow, the angular 

 lax, brownish, upper elongated rectangular. Inner perich. bracts con- 

 volute-sheathing, abruptly apiculate with the excurrent nerve, caps, 

 erect, elongato-cylindraceous, straight or subincurved, estriate, fuscous ; 

 lid pale, with a subulate beak, long as capsule, teeth small, red, deeply 

 cleft. 



Male plant more slender, bracts falcate, innermost shortly acumi- 

 nate. 

 Hab. — Stones and trunks of trees in mountains ; rare. Fr. 8 — g. 



Maidenbower Crags, Dumfries, with Grimmia patens (Herb. Kew). Ben Lawers (Stirton 

 1865) ! ! Glen Prosen (Fergusson 1868) ; all sterile. 



Next to this comes another European species, Dicr. albicans, Br. Sch. 

 [D. emrve, Thed.), which has a still greater development of nerve, and in fact 

 constitutes a transition to Leucobryum. 



20. DICRANUM ASPERULUM Mitt. 



Dioicous ; in silky tufts, tomentose at base ; leaves falcate or 

 flexuose, subovate at base, longly subulate with the serrulate nerve, 

 spinulose at back ; caps, erect, oval-cylindric, lid straight, rostrate. 

 (T. XVII, H.) 



Syn. — Dicranodontium asperulum p.p. WiLS. in Kew Journ. Bot. IX, 296 {1857). 



Dicranmn asperulum Mitt. Journ. Lin. Soc. i, Suppl. 22 (1859). Raeenh. Bryoth. eur. 

 n. 940. 



Dicranodontium aristatum Schimp. Synops. 695 {i860), 2 ed. 99 (1876). Bry. eur. suppl. 

 fasc. I-II, t. I (1864). MiLDE Bry. siles. 75 (1869). 



Dicranodontium lutescens Schimp. MSS.= ? 



Dicranum Dickieanum WiLS. MSS. 



Dicranod. longirostre var. /S. aristatum Juratz. Laubm. Oesterr.-ung. 52 (1882). 



Didymodon aristatus Lindb. Muse, scand. 25 (1879). 



Dioicous ; in lax soft tufts 2—3 in. high, yellow green above, pale 

 brown or ferruginous below, with fine pale or rufous radicles at base ; 

 stem decumbent at base, very slender. Leaves remote and ovate- 

 acuminate at base, becoming longer and closer upward, from an oblong- 

 lanceolate concave base, continued into a long channelled subflexuose 

 arista, with 6—10 ridges at back, serrulate at margin, the highest 

 broader and more concave, with the margin from the middle of the base 

 upward sharply toothed and incurved, the arista very long, secund 

 arcuate, formed of the nerve which is sulcate and spinulose at back. 



