150 LICHENES. [Sticta. 



inflated, brown, polished, acuminate tops ; buds in collections of 

 a greenish- white powder, on the inferior surface of the ends of 

 the lobes ; apothecia substipitate. Ach. L. Un. p. 492. Eng. 

 Bot. t. 126. 



On mountain rocks, common ; apothecia were found near Belfast by 

 Mr. Templeton ; afterwards at Powerscourt Waterfall on trees, by 

 Mr. G. S. Gough. The thallus varies much in the breadth of the 

 lacinice ; it sometimes assumes a suberect growth. 



33. P. diatrypa, ACH. Thallus orbicular, stellate, adpressed, 

 greenish-white; the segments perforate, convex, linear, with 

 expanded and inflated tops; buds in cup-shaped eruptions, their 

 powder paler than the thallus ; " apothecia light red, the border 

 entire." Ach. L. Un. p. 493. Eng. Bot. t. 1248. 



On wet rocks, on Dunkerrou mountain. The perforations of the 

 thallus in our specimens are on the tops of cylindrical elevations ; and 

 the edges are covered with buds in a coarse powder ; in this respect 

 they are unlike foreign specimens in which the buds in finer and paler 

 powder are borne in cup-shaped eruptions. The apothecia have not 

 yet been met with in Ireland. 



26. STICTA. Acn. 



Thallus foliaceous, or coriaceo-cartilaginous, hirsute beneath, 

 and there furnished with hollow or bare spots (ci/phelke) ; 

 apothecia orbiculate, sessile, exteriorly beneath as well as 

 their margins formed of the thallus ; the disk concave, co- 

 loured. 



1. S. macrophylla, FEE. Thallus coriaceous, imbricated, 

 pale-yellowish-green above, smooth and shining ; the segments 

 dilated, sinuated, entire ; apothecia reddish-brown ; the border 

 at length narrow, waved, pale greenish-brown; cyphellce ur- 

 ceolate, empty, whitish. Fee, Crypt, des Ecorces Off. t. 33, 

 /. 1, according to Hooker, Eng. Ft. p. 5, p. 205. Eng. Bot. 

 t. 2697. 



On shady rocks, near Turk Cascade, and on Cromaglown, both near 

 Killarney, W. Wilson, Esq. road side near Kenmare and Killarney, 

 one mile from the tunnel eastward. Thallus tough when recent or 

 moistened, in patches of two or more feet in diameter ; the segments 

 loosely overlapping, and then, sometimes, the upper adheres by its 

 rootlets to the lower ; those that are quite free, concave and channelled ; 

 the central and more fixed, flatter, and even convex ; lobes subdicho- 

 tomous, the terminating pair seldom equal, somewhat retuse, or the an- 

 gles rounded. The surface of a glaucous grey, passing into dark brown 

 when dry. Beneath the thallus is rough, with closely set fibres, that 

 laterally united have a membranous appearance, expanding in a stellate 

 form to attach themselves to subjacent matter. CyphellcR scattered, 

 globular, with a narrow, circular opening at the top ; exteriorly brown- 

 ish, the mouth white, and somewhat jagged; within an interior, delicate, 

 white membrane may be observed, the bottom of which, under a lens, 

 appears minutely mammillated. Apothecia usually marginal, some- 



