144
I.ICHENES.
[Opegrapha.
them as a section, only, of Opegrapha, with which they perfectlyagree in appearance. “ The accessory border to the lirellce, moreor less complete in different species, is but an unsatisfactorydistinction, and the other characters assigned by the greatSwedish Lichenist, are, if constant, too minute for general use.”JBorr.
* Apothecia destitute df an accessory border. ( Opegrapii.e verse.)
1. O. lyncea, Borr. Mss. {grey speckled Opegrapha)-, crust
white subtartareous even uniform, apothecia numerous de-pressed oblong curved rounded at each end somewhat im-mersed csesio-pruinose with a black border_ Arthonia lyncea,
Ach. Syn. p. 7_ Lecidea lyncea, Ach . Meih. — Lichen lynceus,
E. Bot. t. 809.— Opegrapha notha, y. ccesia, Ach . Syn. p. 76.{Borr.)
On the rugged bark of Oak.—This forms patches of considerableextent, spotted with the numerous oblong curved apothecia, whoserather broad disk is pruinose while the slightly raised border is black.
2. O. epipasta, Ach . {smooth dotted Opegrapha); crust very
thin irregularly circumscribed smooth shining varying fromgrey to pale copper-colour, apothecia innate minute scatteredsomewhat parallel slightly convex oblong or roundish mostlysimple with a narrow black edge. Ach . Syn. p. 74. E. Bot.t. 1828? {Borr.) —/3. microscopica; crust coppery glossy, apo-thecia not unfrequently branched. Ach _ O. microscopica , E.
Bot. t. 1911.— Graphis microscopica, Ehrh.
On the smooth bark of trees, especially of young oaks.—This isremarkable for its very thin smooth crust, and the minute dots offructification.
3. O. rubella, Pers. {reddish Opegrapha); crust continuedlimited reddish asli-coloured slightly rugged, apothecia shortrounded somewhat curved their disk broader than the border.Pers. in Ust. Ann. fasc. 7. p. 31. t. 1. f 2. A. a. E. Bot.t, 2347— O. herpetica, (3. Ach . Syn. p. 72.— Lichen rubellus,Ach . Prodr. p. 22.
On the trunks of large trees; communicated by Mr. D. Turner, toEngl. Bot.— Crust ofa reddish smoky hue. Apothecia like dots, numerous,short, rounded-oblong, almost all separate, their disk black, flattened,at least as broad as the margins, frequently broader.
4. O. rufescens, Pers. {rusty Opegrapha); crust cartilagineo-membranaeeous pale ferruginous, apothecia innate variouslyshaped flexuose simple branched and substellated, the diskgrooved nearly plane. {Ach .) Pers. in Ust. Ann. fasc. 7. p. 29.t. 2. f. 3. A. a.- — O. siderella, Ach . Syn. p. 79. — O. phcea?Ach. Syn. p. 78. — 0. herpetica, Ach. ? E. Bot. t. 1789.
On the bark of trees, Mr. Borrer, who suspects that 0 . herpetica ,Ach. and E. Bot, belongs rather to this than O. rubella, and who is byno means certain that the different crust and the lirellce more sheathedby it (“ innate ”) constantly distinguish 0. rufescens from 0. alra.