ToRTULACE^.J 268 [Barbula. 



Bryum tenue imberbe et pallidum, foliis crebrioribus. Dill. Hist. muse. 382, t. 48, f. 46 

 (1741) et Herb. 

 Didymodon rigidulus Hedw. Muse. fr. iii, 8, t. 4 (1792), Sp. muse. 104. Hook. Tayl. 

 Muse. brit. 67, t. 20 (i8i8). Hook. F1. sect. P. H, 135 (1821). 



Desmafodon rupestris Funck in Brid. Bry. univ. i, 822, p.p. (1827). 



Trichosiomum rigidulum var. p. densum Bruch Sch. Bry. eur. fasc. 18-20, p. 10, t. 7 

 (1843). WiLS. Bry. brit. 114 (1855). Schimp. Synops. 149 (i860). 



Trichostomum rigidulum C. Muell. Synops. i, 570 (1849). 



Trichosiomum neglectum WiLS. MSS. 



Tortula rigidula Lindb. de Tort. 249 (1864). Braithw. in Seem. Journ. Bot. 1871, p. 

 293, t. iig, f. 5. HoBK. Syn. br. m. 69 (1873). 



Barbula rigidula Mitt, in Seem. Journ. Bot. 1867, p. 326. Milde Bry. siles. 118 (i86g). 

 Schimp. Synops. 2 ed. 206 p.p. (1876). Juratz. Laubm. oesterr.-ung. no (1882). 

 Lesq. James Mosses N. Amer. 123 (1884). 



Dioicous ; densely tufted, subpulvinate, fuscescent or dirty green. 



Leaves from an erect base, appressed to stem, patent and subrecurved, 



rigid, when dry somewhat incurved and contorted, longly lanceolate, 



carinate, recurved in upper margin, revolute below, nearly smooth, 



basal areolation pellucid, narrowly rectangular, upper distinct, minutely 



quadrate, nerve brownish, continued with lamina into a thick round, 



rather obtuse, obscure point. Perich. bracts resembling the upper 



leaves but more acuminate ; caps, on a red seta, oval-oblong, erect, 



straight or a little curved, brown, glossy ; annulus narrow of 3 rows of 



small cells, lid obliquely beaked, half length of capsule, teeth on a 



narrow basal membrane, the legs free or partly conjoined, obliquate or 



subcontorted. Male plant more slender. 



Hab. — Damp rocks and shady walls ; not uncommon. Fr. 7 — 9. 



Castle Howard (Spruce 1884) ! Blackdown and Hurstpierpoint (Mitten 1847) ! Cliviger 

 (Nowell) ! ! Buxton and Borrowdale (Wilson 1864) ! ! Castleton (Holt 1883) ! ! 

 Plymouth and Taunton (Holmes 1868) ! Whitbarrow and Syergh Fell (Barnes 1867) I ! 

 Callander and Arrochar (Hunt 1868) ! ! Sealby Mills (Spruce 1843) ! Banehory and 

 Crathie (Sim 1872) ! Park Lane, Broughton (Wild 1879). Wychewood, Oxon 

 (Boswell 1879) ! ! Loch Maree (Boswell 1875) ! I Brandon Mtns. (Moore). Sleive 

 Gallion, Derry (Stewart 1876) ! ! Wetherby and Boston Spa, Yorks. (Wesley 1879) ! I 



More compact than the last species, and growing in small tufts, never in 

 wide-spreading sheets. On dry walls it is very short and compact, and may 

 be taken for B. fallax, but the basal areolation will always distinguish it. 

 The older synonymy of this species and the last is so confused that it is not 

 possible to separate them. 



9. BAEBtTLA ACUTA End. 



Dioicous ; csespitose. Leaves erecto-patent, ovate, lanceolato-acu- 



minate, margins recurved, nerve excurrent, perich. long, flexuously 



acuminate. Caps, erect, oblong, exannulate, lid subulate. (T. XL, C.) 



Syn. — Tortula acuta Brid. Sp. muse. I, 265 (1806). 



Barbula acuta Brid. Mant. muse. g6 (1819), Bry. univ. i, 554 (1826). 



Barbula gracilis Schwaeg. Suppl. I, P. I, 125, t. 34 (181 1). Schultz Recens. Barb. 198, 

 t. 32, f. 3 (1823). Brid. Bry. univ. i, 536 (1826). Br. Sch. Bry. eur. fesc. 13-15, p. 22, 



