The English flora - SeaweedAfrica

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144 LICHENES. [Opegraphd.
them as a section, only, of Opegrapha, with which they perfectly
agree in appearance. " The accessory border to the lirellce, more
or less complete in different species, is but an unsatisfactory
distinction, and the other characters assigned by the great
Swedish Lichenist, are, if constant, too minute for general use."
Borr.
* Apothecia destitute of an accessory border. (OpegrapHjE vera?.)
1. O. hjncea, Borr. Mss. {grey speckled Opegrapha); crust
white subtartareous even uniform, apothecia numerous depressed
oblong curved rounded at each end somewhat immersed
csesio-pruinose with a black border Arthoma lyncea,
Ac/i. Syn. p. 7.—Lecidea lyncea, Ach. Meth Lichen lynceus,
E. Bot. t. 809.— Opegraphd notha, 7 . cassia, Ach. Syn. p. 76.
(Borr.)
On the rugged bark of Oak.—This forms patches of considerable
extent, spotted with the numerous oblong curved apothecia, whose
rather broad disk is pruinose while the slightly raised border is black.
2. O. epipdsta, Ach. (smooth dotted Opegrapha); crust very
thin irregularly circumscribed smooth shining varying from
grey to pale copper-colour, apothecia innate minute scattered
somewhat parallel slightly convex oblong or roundish mostly
simple with a narrow black edge. Ach. Syn. p. 74. E. Bot.
t. 1 828 ? (Borr.)—(3. microscopica ; crust coppery glossy, apothecia
not unfrequently branched. Ach O. microscopica, E.
Bot. t. 1911.— Graphis microscopica, E/irh.
On the smooth bark of trees, especially of young oaks.— This is
remarkable for its very thin smooth crust, and the minute dots of
fructification.
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3. O. rubella, Pers. (reddish Opegrapha); crust continued
limited reddish ash-coloured slightly rugged, apothecia short
rounded somewhat curved their disk broader than the border.
Pers. in Vst. Ann. fasc. 7. p. SI. t. 1. /. 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, to
Engl. 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 cartilagineomembranaceous
pale ferruginous, apothecia innate variously
shaped flexuose simple branched and substellated, the disk
grooved nearly plane. (Ach.) Pers. in Vst. Ann. fasc. 7. p. 29.
t. 2. / 3. A. a,— O. siderella, Ach. Syn. p. 79.— O. phcea?
Ach. Syn. p. 78. 0. herpetica, Ach. ? E. Bot. t. 1 789.
On the bark of trees, Mr. Borrer, who suspects that O. herpetica,
Ach. and E. Bot, belongs rather to this than O. rubella, and who is by
no means certain that the different crust and the lirellce more sheathed
by it (" innate") constantly distinguish O. rufescens from 0. aba.