158 LEPTOGIUM. 



phylline, lobate ; from lead- coloured becoming rufous ; the ex- 

 panded, finally crowded and imbricate lobules crenate or at 

 length cut ; apothecia finally almost middling-sized, biatorine, 

 elevated-sessile, flattish; the disk reddish-brown; the entire 

 margin pale. Spores ovoid- ellipsoid, soon muriform-multilocu- 

 lar (the transverse series of spore-cells 4-8), decelerate, ^ mic. 



Collema, Schar. Splcil. p. 520, & Lich. Helv. n. 498. ~Moug. 



& Nestl. Crypt. Vog. n. 1239. Babenh. Lich. Eur. n. 125, 589. 

 Anz. Lich. Langob. n. 411. 



On sandy earth among mosses. Illinois, Hall. The name 



appears to be tolerably certain, but scarcely happy ; the lichen 

 being the largest of the minute Leptogia, and suggesting even 

 finally L. Tremelloides, with conditions of which it grows. 



10. L. lacerum (Sw.) Fr. ; thallus of middling size, lacero- 

 laciniate, reticulately wrinkled; lead -coloured and reddish- 

 brown; the more or less closely aggregated divisions dilated 

 above and sinuate, with finely jagged and fringed edges; apo- 

 thecia small, biatorine, sub-sessile, from concave, flattish; the 

 disk red ; the paler margin entire. Spores ovoid-ellipsoid, muri- 

 form-multilocular (the transverse series of spore-cells 6-12), de- 

 colorate, ^ mic. Ach. L. U.p. 657; Syn. p. 327. 



On rocks, among mosses, in the northern and middle States, 

 common, Muhlenberg Gated. 1818. Canada, Mr. Drummond. 

 Maryland, Twkerman. Ohio, Lea. Northern Alabama, Peters ; 

 Eavenel. 



The North American lichen scarcely ever as well developed 

 as the European finally is ; our plants having commonly the 

 character of the more reduced European states, as, for instance, 

 Schserer's v. lophceum (Lich. Helv. n. 407, in part only, in my 

 copy) and the still smaller, and brown v. pulvinatum (Moug. & 

 Nestl. n. 637), it being understood however, in Arnold's words, 

 that the Exsiccati do not always agree in what they exhibit 

 under these names. 



11. L. sinuatum (Huds.) Schser.; thallus of middling size, 

 sinuate lobate, reticulately wrinkled; dark -glaucous -green, 

 lead-coloured, and fuscescent; the imbricated, plaited lobes 

 rounded and nearly entire; apothecia smallish, zeorine, and 

 biatorine, sessile, from concave becoming flat ; the disk red, with 

 a paler margin. Spores ovoid- ellipsoid, muriform-multilocular 

 (the transverse series of spore -cells 6-11), decolorate, ^ 



