DICRANACE^;.] 161 [Dichodontiwn. 



Dicranum circinatum WILS. Bry. brit. 76 (1855). SCHIMP. Bry. eur. Suppl. fasc. III-IV, t. 



4 (1866). HOBK. Syn. br. m. 47 (1873). 



Dicranodontlum asperulum p.p. WILS. in Kew Journ. Bot. IX, 296 (1857). 

 Dicranodontium circinatum SCHIMP. Synops. 2 ed. 100 (1876). 

 Dicranum comptum SCHIMP. Synops. 2 ed. 97 (1876). 



Dioicous ; laxly caespitose, glossy golden green or fulvous. Stem 

 slender flexuose, 2 5 in. high, dichotomous, geniculato-ascending, more 

 or less rufo-tomentose. Leaves rather distant, enlarging upward, lowest 

 lanceolate, upper very long, secund circinate, from a decurrent sheathing 

 base slightly inflated at the angles, suddenly longly subulate, canalicu- 

 late ; nerve i width of base, of 3 strata of cells, produced into a very 

 long arista, denticulate at back and margin ; cells at angles and mid- 

 base large thin hyaline, hexagono-rectangular, marginal in 4 8 rows of 

 very long narrow green cells. Perich. bracts from a laxly areolate, 

 shortly sheathing base, gradually capillaceous, seta short, fulvous, 

 straight or flexuose, caps, erect subcylindric, castaneous-brown, lid with 

 a long beak, teeth purple, cleft half way, the legs subulate. 

 HAB. Wet grassy places on mountains ; sterile, not common. 



Ben Voirlich by Loch Lomond (Greville 1825) ! ! Ben Mac Dhui (Davies 1861) ! ! Ben 

 Nevis (McKinlay 1862) ! Ben Challum, Perthshire, with D. asperulum (McKinlay 

 1863) ! ! Loch Maree (Hunt 1866) ! ! Glen Phee, Clova (Fcrgusson 1867) ! ! 



The basal areolation is much firmer than in the last species, and the 

 marginal border of very narrow cells much more distinct. Although Harvey 

 placed the species in the genus Thysanomitrium, he must have done so at 

 random, as the calyptra has never been described. 



Subf. 5. ONCOPHOREsE. Plants densely or laxly tufted; leaves 

 chlorophyllose, opake, usually papillose, without enlarged basal angular 

 cells, the upper cells minute, quadrate. Capsule oblong or subcylindric, 

 frequently striate, usually with a strumose neck. 



14. DICHODONTIUM SCHIMP. 



Bry. eur. Coroll. p. 12 (1855). 



Plants laxly tufted, soft. Leaves squarrose, crenato-serrate, 

 papillose, opake, cells rectangular at base, quadrate above, chlorophyl- 

 lose. Calyptra large, cucullate ; capsule solid, pachydermous, smooth, 

 lid rostrate, peristome large, teeth 16, cleft below the middle into 2 3 

 legs, closely trabeculate. 



Inhabiting wet rocks and stones by streams. 



Der. ^x a(a ^0 divide, o^ovs a tooth. 



CLAVIS TO THE SPECIES. 



Capsule cernuous, gibbose ovate ; leaves serrulate at apex. pellucidum. 



Capsule erect, subcylindric ; leaves serrated in upper half. flavescens. 



