Page:The Botanist's Guide Through the Counties of Northumberland and Durham (Vol 1).djvu/207

50 1316. Parmelia coarctata.

Lichen coarctatus.—''Eng. Bot. t''. 534.

On Stones upon Gateshead Fell; and on Stones about Egleston and Gainford, D.

1317. Parmelia amylacea.

On limestone Rocks in Teesdale; and on Boldon and Cleadon Hills, D.

1318. Parmelia sulphurea.

Lichen sulphureus.—Eng. Bot. t. 1186.

On Stones in the Neighbourhood of Egleston; but rare. On Rocks in Horsley Hope Bourn, D.

Obs, Parmelia sulphurea is only a diseased State of P. glaucoma.

1319. Parmelia impolita.

On old Oaks in Newton Cap Wood, near Bishop Auckland; also in the Bishop's Park, D.

Obs. This is perhaps nothings but P. tricolor in extreme old Age.

See 0bs. under tricolor.

1320. Parmelia glaucoma.

On Stones.

Obs. This Parmelia, and Lichen varians and compositus of Bot. Arr. are only different Modifications of one Species; and Parmelia Swartzii must be reduced to another, as its dendritic Crust, the only thing in which it differs from glaucoma, is without doubt, merely accidental. It is not the only Lichen that occasionally appears under this Form: Lecidea fusco-atra, Parmelia parella, and others, sometimes assume this Appearance. Parmelia sulphurea is likewise only a diseased State of P. glaucoma. Withering*s Description of Lichen rupicola, in Bot. Arr. seems also to respect this Parmelia; but those of Linnaeus and Hoffman, which appear along with it, have no doubt. Reference to Hoffman's Lichen rupicola in En. Lich. which is his Verrucaria contorta in Pl. Lich. and Urceolaria Hoffmanni of Ach. and a very different thing from the present Parmelia.-H.

See Obs, under P. sulphurea, and also under L. crenulata.