16 TETRAPHIS. 



though very reluctantly, to remove it from Buxlaumia as a ge- 

 nus, and consequently to a different part of the order in an arti* 

 ficial system* 



1. D.fotiosum. (fAB. VlII.) 



D. foliosum. Mohr Obs. Bot.p. 34. Hook, in Fl. Lond. with a figure. 

 Moug. et Nestl. n. 37. Buxbaumia foliosa. Linn. Syst. Veg. p. 945. 

 Hedw. Engl Bot. t. 329. Turn. Muse. Hib. p. 104. Buxbaumia ses- 

 silis. ScAmzrf.Phascum montanum. Huds. P t maximum. Lightf. 

 Dill. Muse. t.32.f. 13. 



HAB. In woods and on rocks in alpine situations. 



The stems are exceedingly short, and grow in densely- 

 matted patches. The leaves small, ligulate, of a dark 

 green colour, furnished with a strong nerve. The perichae- 

 tial leaves large, erect^ membranous, pale brown, covering 

 entirely the capsule, lanceolato-oblong, acuminated, and to- 

 wards the extremity cut in a singular manner into long slen- 

 der segments at the margin ; nerve strong, rigid, brown, 

 very excurrent, serrulate at the extremity. Capsule large, 

 ovate, gibbous, oblique. Calyptra mitriform. Lid conical, 

 acuminated. Peristome simple, consisting of a plicate mem- 

 brane forming a cone. 



8. TETRAPHIS. 



GEN. CHAU. Frmtstalks terminal; Peristome single, 

 consisting of four equidistant upright teeth ; Ca~ 

 lyptra mitriform. (TAB. I.) 



The lid in the only two known species of this genus is remark- 

 ably thin and scariose in texture, and the teeth are reticulated, 

 not striated as in most mosses. The calyptra is striated, or 

 furrowed ; the leaves are rigid. 



1. T. pelludda ; stems elongated, leaves ovato-aciiminate, 

 those of the perichaetium lanceolate: capsule cylindrical. 



(TAB. VIII.) 



T. pellucida. Hedw. Sp. Muse. t. 7./.I. Engl. Bot. t. 1020. Turn. 

 Muse. Hib. p. 12. Moug. ct Nestl n. 14. Mnium pellucidum. Linn. 

 Dill Muec.t.3l.f.2. 



