10 MUSCI-ACROCARPI-GYMNOSTOMI. [Gymnostomum. 



space between the outer coat of the capsule and the proper membrane 

 enclosing the seeds. The inner membrane (or seminal bag) is attached 

 by numerous threads or veins to the inside of the outer covering, and 

 from the base proceeds a bundle of filaments, forming in appearance a 

 pillar, but really serving as a -cable to keep the theca steady. As the 

 theca enlarges in its progress towards maturity, the lateral threads 

 which, at first, are straight and tight, become lax, and the bundle of 

 threads at the base likewise : — the inner surface of the outer covering 

 is overspread with anastomosing veins of a spongy lax texture, not very 

 firmly attached. — This appearance does not occur in G. fasciculare; 

 as the theca does, from the first, almost fill the cavity formed by the 

 outer skin, though a very short bundle of vessels is sometimes visible at 

 the base." W. 



13. G. tenue, (few-leaved Beardless-Moss); stems scarcely 

 any, leaves linear-lanceolate entire erect obtuse short with a 

 strong nerve disappearing below the summit, the upper or peri- 

 chsetial ones much elongated and with an obscure nerve, capsule 

 oblong, lid acuminated. Hedw. Sp. Muse. t. k.f. 1 — 4. Drum. 

 Muse. Scot. v. 2. n. 11. Muse. Brit. ed. 2. p. 24. t. 7. — G.pau- 

 cifolium, E. Bot. t. 2506. — Dicranum cylindricum, Fl. Brit, 

 p. 1221. — Dry urn paucifoliun?, Dicks. Cr. Base. 4. t. 11./. 3. 



On walls and sandstone rocks ; but rare. Mr. IV. Wilso?i has lately 

 detected it on walls at Timperley, Cheshire, and Mr. T. Drummond on 

 red sandstone near Belfast. Fr. June. 



14. G. Donidnum, Sm. (Donian Beardless-Moss); stem 

 scarcely any, leaves subulate, capsule turbinate, lid hemisphe- 

 rical with an acuminated point. E. Bot. t. 1582. Drum. 

 Muse. Scot. v. 2. n. 10. Muse. Brit. ed. 2. p. 25. t. 7. 



Sandstone rocks, Scotland. Den of Dupplin ; Mr. G. Don. Den 

 of Airly and at Norran water, Mr. T. Drummond. Cawsey Dene, near 

 Newcastle ; and limestone rocks, High Force of Tees, R. B. Bowman, 

 Esq. Argyleshire, Rev. Colin Smith. Fr. Nov. — A most minute and deli- 

 cate moss ; forming a stratum upon the surface of the sandstone rocks, 

 in the few places where it has been found. Capsule exactly turbinate, 

 pale. 



15. G. microstomum, Hedw. (small-mouthed Beardless-Moss); 

 leaves broadly subulate, their margins involute above the 

 middle flexuose crisped when dry, capsule elliptical contracted 

 at the mouth, lid subulate incurved. Hedw. St. Cr. v. 3. t. 30. 

 Fl. Brit. p. 1165. E. Bot. t. 2215. Drum. Muse. Scot. v. 1. 

 n. 10. 3Iusc. Brit. ed. 2. p. 25. — G. rutilans, Hedw. Sp. Muse, 

 t. 3.f. 8 — 11. — Hymenostomum microstomum, Br. in Linn. Trans, 

 v. 12. p. 572. Bryol Germ. p. 199. t. 12. / 4. (to which we 

 think may safely be added, of the last-mentioned work, H. ruti- 

 lans, I. c. t. 12. /. 5., H. brac/tycarpicm, t. 12. /. 3. H. squarrosum, 

 t. 12. /. 1., H. obliquum, t. 12. /. 2., H. subylobosum, t. 12. f. 6. 

 and H. crispatum, t. \2.f. 7. 



Banks, not unfrequent, especially in subalpine countries. Fr. April. — 

 Every one who has gathered this plant, must have been aware of the 

 difficulty, I might almost say impossibility, of distinguishing it from 

 Weissia controvcrsa, except by a minute examination of the mouth of the 



