DICRANACE^B.] 126 [Didymodon. 



Dicranodontlum longirostre BR. SCH. Bry. eur. fasc. 41, p. 2, t. i (1848). RABENH. 

 Deutsch. Kr. fl. ii, S. 3, 149 (1848). WILS. Bry. brit. 86, t. 39, (1855). SCHIMP. Synops. 

 96 (1860), et 2 ed. 99 (1876). BERK. Handb. br. m. 274 (1863). MILDE Bry. siles-75 

 (1869). DE NOT. Ep. bri. ital. 636 (1869). HUSN. Mouss. nord-ouest 55 (1873). HOBK. 

 Syn. br. m. 49 (1873). JURATZ. Laubm. oesterr. ung. 52 (1882). 



Trichostomum longirostre HARTM. Skand. fl. 

 Didymodon denudatus LINDB. Muse, scand. 25 (1879). 



Dioicous; in soft tufts, i 3 in. high, erect or ascending, almost naked 

 at base, pale or glossy yellow-green above, interwoven with rufous 

 tomentum. Leaves readily deciduous, falcato-secund, from a subva- 

 ginant base, longly subulate, involute-concave, serrate or entire at 

 apex, smooth at back; basal auricles suddenly inflated, equal to all 

 base of wing, hyaline and usually rufescent toward margin, upper cells 

 small, quadrate ; nerve broad flattened, half width of base, excurrent. 

 Perich. bracts longly sheathing, suddenly subulate with the excurrent 

 nerve, laxly areolate below; seta pale, flexuose. Capsule small, sub- 

 cylindric, leptodermous, pale brown, nearly equal ; lid straight, rostrate, 

 long as capsule ; peristome pale red. Male infl. terminal, gemmaceous. 



HAB. On turfy banks and rotten wood in subalpine districts. Fr. very 

 rare. 8. 



Cromagloun (Taylor 1841). O'Sullivan's cascade (Hunt 1867) ! Stirrup wood, Mottram 



DO) ! ! Highgreen wood, Heptonstall (Nc 

 Staley brushes (Hunt 1865) ! ! Bolton (Dr. Wood). Trefriew, Carnarvon (Dr. Wood 



(Whitehead 1860) ! ! Highgreen wood, Heptonstall (Newell) ! ! Hebden valley and 



1863) ! Bowness (Hunt 1871) ! Trossachs (Wilson 1858) ! ! Campsie (McKinlay) \ 

 Ben Arthur (Dr. Stirton 1866) ! Barmouth (Whitehead 1877) ! ! Skye, in fruit (Prof. 

 Law son 1872) ! ! 



Var. ft. alpinus (Schimp.) 



Plants taller and more robust ; leaves not deciduous, erect or subsecund 

 rather rigid. 



SvTX.Campylopus alpinus SCHIMP. Bry. eur. Suppl. I-II (1864). BRAITHW. Journ. Bot. 1870, 



p. 389. HOBK. Syn. br. m. 51 (1873). 



Camp, pachyneuros MOLENDO Moos-stud, aus dem Alg. alp. 63 (1865). 

 Camp, intermedius WILS. MSS. 



HAB. Twll-Du near Llanberis (Wilson) ! Arrochar, with fruit (McKinlay). Callander (Stirton). 

 Glen Callater and Stronaclacher (Hunt) ! ! Ben More in Glen Dochart (Schimper 

 1865) ! Summit of Ingleboro (Hunt 1867) ! ! Powerscourt, Lough Bray, Kelly's Glen, 

 Cushendall and Kylemore (Moore) \ ! Cader Idris (Whitehead 1879) ! ! Ben Wyvis 

 (Howse 1870) ! 



This very variable moss resembles Ditrichum flexicaule, from which it is 

 easily separable by the different areolation of the leaf at base. 



In Bot. Zeit. 1870, p. 392, Milde has an excellent paper " ueber Dicrano- 

 dontium," in which he shows that Camp, alpinus must be referred as a variety 

 to the present species, as Juratzka had already done in Hedwigia, 1867, 

 p. 1 80, the rhombic and oval upper cells of a Campylopus being absent. He 

 enumerates five other varieties, one of which circinatum, must be restored to 

 specific rank, and placed, as Mitten has done, under Dicranum uncinatum. 



The second species Die. aristatum SCHIMP. must also be referred without 

 the slightest doubt to Dicranum asperulum MITTEN, with fertile Indian plants 

 of which ours agrees precisely in leaf-structure. 



