184 TORTULACE/E. 



Leaves concave, rather shorter and wider, margin less widely 

 recurved, hair-point rather shorter. Seta shorter, capsule 

 smaller, oblong ; lid half the length of the capsule ; peristome 

 from a long tubular basal membrane, forming a tessellated tube 

 for almost half its length. Autoicous. 



Hab. On earth, very rare ; Hastings ; Clova ; Radnor ; Cornwall. Fr. 

 spring. 



Although the vegetative points of difference between this and the last species are 

 of some value, it would hardly be safe to attempt to distinguish barren plants from T. 

 muralis ; the difference in the tube of the peristome is the only obvious and, of course, 

 an important difference. It is, however, a smaller plant in all its parts than the 

 typical form of that species. 



The pale yellowish border to the leaf, mentioned under T. muralis, is more 

 marked in this plant owing to the margin being less recurved, and indeed sometimes 

 almost plane. 



D. SYNTRICHIA. 



14. Tortula subulata Hedw. (Bryum subulatum L. ; Barbula 

 subulata P. Beauv., Schp. Syn.) (Tab. XXVIII. A.). 



Stems loosely tufted or densely gregarious, short, rarely t-inch 

 in height, bright green. Leaves large, 2-3 lines long, erecto- 

 patent or more widely spreading, when dry crisped and contorted, 

 but hardly spirally twisted, with the yellowish margins and 

 strongly prominent pale glossy nerve conspicuous ; oblong- 

 lanceolate or narrowly oblong-spathulate , at apex rounded and 

 shortly acute, or slightly tapering ; nerve stout, excurrent in a 

 longer or shorter mucro, margin slightly but variably recurved, 

 sometimes on one side only, or quite plane, with a distinct yellow 

 border of linear , often bistratose cells reaching from the base to 

 a variable height, sometimes to apex, but usually vanishing near 

 the middle, at apex slightly denticulate, irregularly crenulate, 

 or almost entire; cells of the lamina at base lax, hyaline, 

 rectangular, narrower and yellow at margin, becoming chloro- 

 phyllose and smaller above, in upper part rounded or rounded- 

 quadrate, rather variable in size, obscure, very chlorophyllose and 

 finely papillose or almost smooth. Seta stout, \- § inch long, 

 reddish, strongly twisted and angular when dry ; capsule large, 

 very long (frequently \- inch), cylindric, slightly curved, thick- 

 walled ; lid rather obtusely rostrate, \ length of capsule ; calyptra 

 large, shining, golden brown ; peristome long, pink, the teeth 

 united into a tube for about § their length. Autoicous. 



