36 MUSCI-ACROCARPI-PERISTOMI. [Dicrtlnmn. 



bcrgii, dicarpos and acacioides). — Hypnum asplenioides, Dicks. 

 Cr. Fasc. 2. t. 5.JI 5. — y. stem short simple, capsule inclined. D. 



tamarindifolium, Turn. Muse. Hib. p. 55. Fl. Brit. p. 1231 



F. incurvus, Schwaegr. Suppl. t. 49. — Fissidens tamarindifolius, 

 crispus, longifolius and linearis, Brid. — F. palmatus, Hedw. St. 

 Cr. v. 3. t. 30. A. ? 



Moist banks and in woods, frequent. #. frequent on moist rocks. 

 Fr. Winter. — A very variable plant ; from which the D. osmundioides 

 of authors does indeed at first sight appear to be distinct ; for the stems 

 are elongated, branched, almost erect with yellowish foliage : yet I see 

 no reason to consider it other than as a variety; though in this opinion 

 I am at variance with most Muscologists, especially the continental 

 ones. The structure of the leaves in this and the remaining species of 

 this division is highly curious, and totally unlike that of any other moss 

 with which I am acquainted. Besides being vertical, their upper half 

 (taking the nerve for the line of separation) is from the base beyond 

 the middle composed of two lamellae, the lower part of which embraces 

 the stem, while the rest often embraces a portion of the leaf placed im- 

 mediately above it. 



The moss which engaged Mungo Park's attention so much in Africa 

 as to revive his drooping spirits when sinking under fatigue, is this 

 species ; as I have ascertained by means of original specimens given to 

 me by his brother-in-law, Mr. Dickson. 



2. D. adiantoides, Sw. (Adiantum-like Fork-Moss); seta lateral, 

 perichaetial leaves ovate slightly convolute pointed. Sw. Muse. 

 Suec.p. 31. Turn. Muse. Hib.' p. hi. FL Brit. p. 1234. Hobs. 

 Brit. Mosses, v. 2. n. 34. Brum. Muse. Scot. v. 1. n. 32. Muse. 

 Brit. ed. 2. p. 90. t. 16. — Fissidens adiantoides, Hedw. St. Cr. 

 v. 3. t. 36. Schwaegr. Suppl. v. 1. P. II. p. 10. Brid. Meth. 

 p. 191, together with F. grandiflorus of the same author and 

 F. dubius, Beauv. — Hypnum adiant. Linn. — E. Bot. t. 264. — 

 Dill. Muse. t. 34. /. 3. 



Moist banks, wet pastures and bogs. Fr. Spring. — Leaves nearly 

 lanceolate, more or less serrulate at the point. The base of the setce is 

 surrounded by a remarkably scaly perichcet'ium, whose leaves are very 

 unlike those of the stem, being ovate, concave, convolute, nerveless, ex- 

 cept at the revolute point, which is flattened and its edge vertical. 

 These are inserted on the side of the stem, and from below the peri- 

 chaetium reddish roots are thrown out, exactly as in the following species, 

 from which it scarcely differs but in the situation of the fruit, and of 

 which Wahlenberg considers it a variety. 



3. D. taxifolium, Sw. ( Yew-leaved Fork-Moss); seta arising 

 from the root, perichaetial leaves ovate sheathing convolute 

 pointed. Sic. Muse. Suec. p. 31. Turn. Muse. Hib. p. 56. 

 II. Brit. p. 1233. Hobs. Br. 3Iosses, v. 1. n. 35. Drum. Muse. 

 Scot. v. 1. n. 31. Muse. Brit. ed. 2. p. 91. t. 16. — Fissidens 

 taxif. Hedw. Sp. Muse. t. 39. Schwaegr. Suppl. v. I. P. II. 

 p. 10.— Hypnum, Linn.—E. Bot. t. 416— Dill. Muse. t. 34. 

 f.2. 



Moist banks. Fr. Winter. 



