SUPPLEMENT.] 231 



HAB. Clay soil in calcareous districts, very rare. Fr. 121. 



Near Seaford, Sussex (W.J. Nicholson 1903), also near Rottingdean and Newhaven. 



Closely resembling some forms of P. Starkii or Davallii. The capsule is 

 very large for the size of the plant. 



Pottia Davallii (SMITH) LINDB. 



See ante vol. i, 201, is generally regarded as a species, and it is on account 

 of being quite gymnostomous that it must hold this position. This group of small 

 mosses has such a close resemblance in the vegetative organs, that it is difficult 

 to decide the question of specific value. 



TORTULA ( DESMATODON) CERNUA (Hueben.} Lindb. 

 Autoicous; stems short, densely tufted. Leaves oblongo-lanceolate 

 cuspidate, erecto-patent, entire, nerve excurrent. Capsule cernuous, ovato- 

 globose, gibbous ; lid conic with a short point. (T. CXXVI, C.) 



Svn.Cynodontiutn latifolium SCHWAEG. Suppl. I, P. I, no, t. 28 (l8ll). 

 Didymodon latifolius WAHLEN. Fl. lapp. 313, t. 20 (1812). 

 Cynodon latifolius WEB. MOHR. Bot. Tasch. 154 (1807). BRID. Mant. 99 (1819), Bry. univ. i, 



Dermatodon cernuus HUEBEN. Muse. germ. 117 (1833). 



Anacalypta inclinata NEES Mse. SENDTNER. 



Desmatodon indinatus SENDT. in Regens. Denksch. iii, 143 (1841). 



Desmatodon cernuus BR. SCH. Bry. Eur. fasc. 18 20, p. 8, t. 5 (1843). SCHIMP. Synops. 

 160 (1860), 2 ed. 186. DE NOT. Epilogo 572 (1869). JURATZ. Laubm. fl. Oest.-Ung. 130 

 (1882). HUSNOT Muse. gall. 94, t. 26 (1885). LIMPR. in RABENH. D. kr. fl. Laubm. i, 

 652 (1888). 



Trichostomum indinatum C. MUELL. Syn. i, 593 (1849). 



Trichostomum cernuum LINDB. De Tort. 225 (1864). MILDE Bry. siles. 100 (1869). 



Tortula cernua LINDB. Muse, scand. 20 (1879). 



Autoicous ; densely tufted, \ i in. high, green above, fuscous below. 

 Leaves erecto-patent, a little twisted when dry, lower small, upper crowded, 

 lineal spatulate, acutely pointed, keeled, margin revolute in lower half, 

 flat and obsoletely serrate above, crenulate with geminate pupillae, nerve 

 rufous, excurrent in an acute point, cells hexagonal, minute and chloro- 

 phyllose above, oblongo-hexagonal and inflated below, those of limb 

 elongate, in 2 3 rows. Seta yellow, capsule cernuous or horizontal, 

 yellowish-brown, short, ovate gibbous ; lid small conic, shortly pointed, 

 annulus pluriseriate. Teeth of peristome 16, cleft into 2 3 filiform or 

 partly cohering legs, rufous, papillose. Spores large, tuberculate. 

 HAB. Damp walls and clefts of rocks in sub-alpine places ; very rare. Fr. 9. 



Wall at Barwick near Aberford, Yorkshire (G. Webster 1900) ! 1 



A very distinct moss, with a remarkably small capsule not unlike that of 

 Catoscopium. 



