22 MUSCI-ACROCARPI-PE1USTOMI. [ Weissia. 



Moist rocks; in fructification at Campsie, near Glasgow. About 

 Powerscourt Waterfall, near Dublin, common, but barren. Fr. (fully 

 ripe) April. — The stems are elongated, flaccid, loosely tufted, branched, 

 branches spreading. Leaves lax, spreading, one third of an inch long, 

 linear-acuminate, grooved, flexuose, entire, waved at the margins, 

 which are not at all recurved; their substance is rather thick, yet 

 tender, composed of such minute cellules as to have no appearance of 

 being reticulated, the nerve strong and reaching to the point. Fruit 

 rare. Seta scarcely an inch long, pale reddish-yellow, sometimes two from 

 the same perichaetium. Capsule cylindrical or oblongo-cylindrical, each 

 with its side slightly unequal. Lid subulate, straight, two-thirds of the 

 length of the capsule, reddish-yellow ; calyptra dimidiate. Peristome of 

 16 equidistant, linear-subulate, somewhat torulose, red teeth, erect when 

 dry, when moist forming a cone or arch over the mouth of the cap- 

 sule. — The general habit of this plant is quite peculiar among the 

 Weissice, having loosely entangled, spreading stems and remarkably 

 flaccid patent leaves, in these last particulars resembling Trichosto- 

 mum Barbula, Sehwaegr.; and still more Tortula tortuosa. The 

 peristome, however, is that of a Weissia. In some respects it approaches 

 in the general form of the leaves and of the capsule, W. curvirostra ; but 

 that is abundantly distinguished by its erect, bright red, wiry stems, its 

 leaves much shorter and smaller, less waved, so distinctly recurved at 

 the edges as to be margined : and above all by its lid, whose beak is far 

 shorter, more obtuse and oblique in its direction. In April, 1831, 

 Dr. Greville and myself gathered numerous specimens in the Campsie 

 station, but the fruit was rare. 



12. W. curvirostra, Hook, and Taylor, (curve-beaked Weissia); 

 stems elongated wiry (usually red), leaves patent linear-subu- 

 late margined with the revolute edge, nerve strong, capsule 

 ovato-cylindrical, lid shortly rostrate oblique, teeth of the 

 peristome subulate erect. Muse. Brit. ed. 1. p. 46. ed. 2. 

 p. 84. t. 14. Drum. Muse. Scot. v. 2. n. 34. — W. recurvirostra, 

 Hedw. St. Cr. v. 1. t. 7 '.—Grimmia recurvirostra, Fl. Brit, 

 p. 1190. E. Bot. t. 1438. — Bryum curvirostrum, Dicks. — 

 Dill. Muse. t. 48./. 45. 



On sandy or gravelly moist banks. Fr. Sept.— Habit of a Tortula. 

 The nerve is dark and strong, rendering the leaves peculiarly rigid. 



13. W. crispula, Hedw. (curled Weissia); stems elongated 

 branched, leaves from a broad base lanceolato-subulate crisped 

 when dry, their margins incurved, capsule ovato-elliptical, lid 

 rostrate. Hedw. Sp. Muse. t. 12. /. 1 — 6. Drum. Muse. Scot, 

 v. 1. n. 28. Muse. Brit. ed. 2. p. 84. t. 15. — Grimmia crispula, 

 Turn. Muse. Hib. p. 28. Fl. Brit. p. 1192. E. Bot. t. 2203. 



On rocks, especially in mountainous districts, abundant. Fr. May. — 

 Around the setae the leaves form a sort of perichaetium. 



14. W. controversa, Hedw. (green-cushioned Weissia); stems 

 short nearly simple, leaves linear- subulate crisped when dry, 

 the margins involute, capsule ovato-elliptical, lid rostrate. Hedw. 

 St. Cr. v. 3. t. 5. Drum. Muse. Scot. v. 2. n. 35. Muse. Brit, 

 ed. 2. p. 85. t. 15. — W. microdus, Sehwaegr. Suppl. v. I. p. 77. 

 — Grimmia controversa, Fl. Brit. p. 1177. E. Bot. t. 1367. 



