GYALECTA: 219 



Lecidea, Sorr. in Hook. Brit. Fl 2, p. 183. Nyl. Scand, p. 191 ; 

 Licli. N. Caled. p. 40. 



On bark, etc., at the base of trees, Pennsylvania, Muhlenberg 

 Catal 1818. New England, Frost; Willey. New York, Eav- 

 enel. New Jersey, Austin. 



3. G. Valenzueliana (Mont.) Tuckerm. ; thallus thin, chinky, 

 soon becoming densely granulate; glaucescent: apothecia mi- 

 nute, sessile, globular; consisting of a flesh-coloured proper 

 exciple, clothed below by the thallus ; connivent and radiately 

 cleft above; and opening by a pore-like at length somewhat 

 enlarged aperture, with a finally rounded, and blackening mar- 

 gin. Spores 12-30 in the thekes ; ellipsoid; bilocular; ^ mic. 



Parmelia ( Urceolaria) Mont. Cuba, p. 205. Gyalecta, Tuck. 



Calif, p. 30. G. asteria, Tuck. Obs. Lich. 2, I c. p. 414, & in 

 Wright Lich. Cub. n. 173. Apothecia O mm -, 3 to O mm , 5 wide. 



* absconsa, Tuckerm. ; thallus uncertain ; spores smaller, 4- 

 locular ; ^-. Gyalecta absconsa, Obs. Lich. 2, /. c. p. 414. 



On bark, a, Cuba, Wright. Cotoosa river, Florida, Austin. 

 * on Red Maple, low country of South Carolina, Ravenel. 

 The specimens of this last are very meagre, and it is hard to say 

 whether the thallus belong not entirely to the accompanying 

 Arthonia spectabilis. Spores finally numerous in the thekes, as 

 in a, but smaller, and always 4-locular. The lichen is insuffi- 

 ciently known. G. radiatilis, Tuckerm. Calif, p. 30, is a still 



more minute apothecium exceedingly like that of G. Valensue- 

 liana (being globular, from flesh-coloured becoming black, con- 

 nivent and radiately cleft above ; but with simple spores in 

 eights, and giving no reaction with iodine), which infests (in'New 

 England always) a white thallus with little doubt to be referred 

 to Pertusaria multipuncta ; as the parasitic fruit to Fungi. It 

 is easy, with the scanty material in hand, to suppose that G. 

 absconsa may, in like manner be only parasitic on the thallus of 

 Arthonia spectabilis j but there is no doubt of the close relation 

 of the former to G. Valenzueliana, which is in every point of 

 view a lichen. 



4. G. geoica (Wahl.) Ach. ; thallus obscure, somewhat pow- 

 dery ; pale-greenish-ash-coloured ; apothecia minute, immersed 

 becoming superficial, urceolate; the elevated, radiously uneven, 

 pale margin enclosing a yellowish-brown disk. Spores oblong- 



