Endocarpon.] LICHENES. 99 



volute, the exterior spreading and cut. E. Weberi, Ach. L. 

 Un. p. 304. Eng. Bot. t. 594. 



. on dry rocks ; /3. on rocks occasionally inundated or bedewed ; 

 7. usually on submersed stones. The two first varieties are common, 

 the third was found by Mr. Robert Brown, on Knockcurris, in Inni- 

 showen, according- to Mr. Templeton. The union of the three Acha- 

 rian species is adopted from Dr. Hooker, in his English Flora, vol. 5, 

 p. 156. In the first variety, the flesh coloured globular nucleus, con- 

 tained in a coat somewhat less transparent, is surmounted by a minute 

 convex, light brownish covering, (appearing on the surface of the 

 frond,) which is rather papillary than porous ; although when moist 

 an irregular opening may be observed. In the other varieties the 

 appearances on dissection are similar ; the tops of the apothecia, 

 however, are darker. 



2. E. pusillum, HEDW. Thallus in minute, scattered, sub- 

 cartilaginous, flat, greenish-grey, rotundo-angulate and slightly 

 lobed scales, adhering by dense, pale fibres beneath ; apothecia 

 4, 5, or more, on each scale, the orifice porous, dark brown. 

 Hedw. St. Cr. v. 2, p. 56, t. 20, / A. Eng. Bot. t. 95. E. 

 Hedwigii, Ach. Lich. Un. p. 298. 



On wet sides of ditches, at Dunkerron, County of Kerry. Scales 

 about one twentieth of an inch in diameter ; when dry almost white, 

 when moistened greenish-grey, or even of a lively green. Nucleus 

 pale, gelatinous, large in proportion to the size of the scale ; the orifice 

 of the apothecia, a pore with a brownish margin. 



3. E. lachneum, ACH. Thallus in lobed and imbricated, 

 subcoriaceous, slightly-greenish brown scales, the margins ele- 

 vated and waved ; dark brown beneath ; apothecia numerous, 

 with convex, light brown tops. Ach. Lich. Un. p. 299. Eng. 

 Bot. t. 1698. E. squamulosum, Ach. L. Un. p. 299. 



On rocks in mountain streams, at Carig mountain, County of Kerry. 

 The edges of the thallus are far more free and elevated than in the 

 preceding, the colour never becomes quite green by moisture, but still 

 retains much of its brown hue ; the thallus swells less when wet, and 

 the apothecia are more numerous. The nucleus is slightly of a flesh 

 colour, otherwise the structure of the apothecia is as in E. pusillum, 

 Hedw. 



4. E. pallidum, ACH. Thallus foliaceous, somewhat imbri- 

 cated, lobed, crenate, pale greenish-grey, slightly spongy and 

 black beneath, the outermost lobes pale and naked on the under 



side ; apothecia immersed, black. Smith. . Ach. L. Un. 



p.Wl. Eng. Bot. t. 2541. 



" On rocks thinly covered with earth, Ireland, Sir Thomas Gage.* 

 I have never seen an authentic specimen of this species ; it is here 

 given on the authority of Sir James E. Smith. 



5. E. leptophyllum, ACH. Thallus cartilagineo-foliaceous, 

 roundish, of a dark-grey, the circumference spreading, flexuose, 

 smooth and blackish beneath ; apothecia numerous on each 



