132 D I P L O P E R I S T O M I. [ Orthotrichum. 



deeply and regularly cleft down the middle. O. aureutn of 

 Mart. Fl. Crypt. Erlang. p. 77. t. 2. is but a green variety of 

 this plant with more flaccid leaves. 



12. O. Ludwigii ; stems creeping, leaves erecto-patent narrowly 

 lanceolate crisped when dry, capsule pyriform smooth fur- 

 rowed only at the extremity, mouth extremely contracted, 

 calyptra remarkably hairy. (SuppL. TAB. IV.) 



Orthotrichum Ludwigii. Srid. Muse. SuppL p. 26. Schwaegr. 

 Suppl v. 1. P. //. p. 24. t. 51. Moug. et Nestl n. 617. Sturm, 

 Deutschl. Fl. ic.? Hook, and Grev. in Edin. Journ. of Science, v. 1. p. 

 125. Drummond, Muse. Scot. v. 2. n. 52. Am. Disp. Muse. p. 18. 

 Grev. Scot. Crypt. Fl. t. 133. 



Orthotrichum clausum. Hornscli. MSS. ? 

 Ulota Ludwigii. Srid. Meth. p. 112. 



Splachnum Wulfenianum. Schwaegr. Suppl. v. 1. P. I. p. 46. t. 14. 

 HAB. Hill of Finhaven, five miles east of Forfar, Scot- 

 land; on Beech-trees, rare. Mr. Drummond. Abun- 

 dant upon young oaks in subalpine glens in various 

 parts of Scotland. 



The foliage and ramification of this species very much resem- 

 ble those of O. Drummondii, and the two mosses are frequently, 

 at least in this country, found mingled into one tuft. The cap- 

 sule of O. Ludwigii differs, however, essentially, not only from 

 that of its congener, but from that of every species of Orthotri- 

 chum with which we are acquainted. It is exactly pyriform, 

 of a very pale hue, smooth, furrowed only at the very ex- 

 tremity, and at the mouth so remarkably contracted, as when 

 dry, to leave no perforation at all, the base of the teeth literally 

 meeting together. This species, we have every reason to 

 believe, has been passed over for O. crispum, in consequence of 

 the similarity of its place of growth, and its crisped leaves. 

 The capsule, however, is totally dissimilar, and the leaves are 

 not more crisped than those of O. Drummondii. 



It was not before we had examined very numerous specimens 

 of this plant, both natives of the continent and of our own 

 country, that we were enabled to ascertain the presence of an 

 inner peristome. It is composed of eight exceedingly slender 

 ciliae, arising from the sides of the teeth, and, from their highly 



delicate nature, they are extremely fugacious. They are 



16 



