74 APLOPERISTOMI. [Pterogonium. 



and creeping habit and lateral fructification. In its habit, and 

 usually upright capsule, it is closely allied to Neckera, from which 

 it is known by the single peristome. 



1. Pt. Smithii; stems much branched, branches pinnate, leaves 



Ungulate obtuse entire crisped when dry their margins re- 

 curved, nerve reaching about half way up, fruitstalks very 

 short, lid rostrate. (TAB. XIV.) 



Pterogonium Smithii. Swartz, in Schrad. Journ. v. 2. p. 173. 

 Smith, Fl. Brit. p. 1271. Engl Sot. t. 1326. Sckwaegr. Suppl v. 1. 

 p. 105. and v. 2. p. 31. t. 109. Hobson, Brit. Mosses, v. 2. n. 25. 

 Arn. Disp. Muse. p. 50. 



Lasia Smithii. End. Meth. p. 133. 



Hypnum Smithii. Dicks. Cr. Fasc. 2. p. 10. t. 5. / 4. Hedw. Sp. 

 Muse. p. 264. t. 68. / 57. 



HAB. Trunks of trees in the Southern parts of England ; 



abundant in Devonshire. 



This elegant moss differs from the remaining British Ptero- 

 gonia, in having its stems very much branched, and in these, as 

 well as the leaves, curling remarkably when dry ; the fruit, too, 

 which is not commonly produced, is nearly sessile ; the fruit- 

 stalk slightly curved. 



2. Pt. gracile ; branches fascicled curved, leaves broadly ovate 



acute concave, their margins plane summits serrated faintly 

 two-nerved at the base, lid conical. (TAB. XIV.) 



Pterogonium gracile. Swartz, Muse. Suec. p. 26. Smith, FL Brit, 

 p. 1270. Engl. Bot. t. 1085. Schwaegr. Suppl. v. 1. p. 105. Brid. 

 Meth. p. 126. Hobson, Brit. Mosses, v. 1. n. 26. Funck, Deutschl 

 Moose, t. 13. 7i. 5. Hook. Fl. Scot. P. II. p. 129. Arn. Disp. Muse. 

 p. 49. 



Pterigynandrum gracile. Hedw. St. Cr. v. 4. t. 6. 

 Grimmia ornithopodioides. Mohr. 

 Hypnum gracile. Linn. 



HAB. Rocks in subalpine countries, frequent. 

 Miss Hutchins found a variety of this species with the leaves 

 unusually broad, and the whole plant of a blackish green colour. 

 A careful examination of good specimens of the fruit of this 

 plant will exhibit something of an inner peristome, viz. a very 

 narrow membrane as at the base of the ciliae of Neckera, yet 

 terminating so irregularly as not to justify us in placing this 

 among the mosses which have a double peristome. 



