. A monograph of lichens found in Britain; being a descriptive catalogue of the species in the herbarium of the British Museum. Lichens. 492 IICHENACBI. [PERTOSAEIA. Soc Cherb. iii. p. 180.—Thallus continuous, verrucoso-unequal, or smoothist, very rarely hypopLlceodal. Apothecia endocarpoid or lecanoroid; spores l-4r)se, 6-8n8e, large, ellipsoid or oblong, colourless, rarely blackish, with a thick or thickish epispore; paraphyses lax or coherent, variously branched and arcuate; hymenial gelatine, but chiefly the thecse, deep-lilac with iodine. Spermogones with acicular, straight spermatia. A n
. A monograph of lichens found in Britain; being a descriptive catalogue of the species in the herbarium of the British Museum. Lichens. 492 IICHENACBI. [PERTOSAEIA. Soc Cherb. iii. p. 180.—Thallus continuous, verrucoso-unequal, or smoothist, very rarely hypopLlceodal. Apothecia endocarpoid or lecanoroid; spores l-4r)se, 6-8n8e, large, ellipsoid or oblong, colourless, rarely blackish, with a thick or thickish epispore; paraphyses lax or coherent, variously branched and arcuate; hymenial gelatine, but chiefly the thecse, deep-lilac with iodine. Spermogones with acicular, straight spermatia. A natural and well-defined genus, most of the European species of which occur in our Islands, where also one or two seem to be endemic. Several of the plants included in it frequently occur only in a variolarioid or isidioid state, constituting the pseudogenera Variolaiia and Isidium of older authors. A few of these enumerated by Turner and Borrer in their ' Lichenographia Britannica' and subsequently figured in Eng. Bot. Suppl., being very doubtful, are here omitted. A. Thecse pauci-spored ; spores colour- less. a. Spores solitary. 1. P. hryontlia Nyl. Lich. Scand. (1861) p. 178 ; Flora, 1881, p. 538. —Thallus effuse, thin, subgranulato- un equal, white or whitish, white-sore- diose (K+yellowish, soredia CaCl-)- reddish). Apothecia lecanorine, mode- rate, at first urceolate, then subplane, prominent or substipato, opaque, sordidly liver-coloured, or sordid- brownish, the thalline margin at length depressed or excluded; spores 0,150-0,230 mm. long, 0,050-70 mm. thick.—Cromb. Lich. Brit. p. 58 ; Leight. Lich. Fl. p. 240, ed. 3, p. 230.—Parmelia svhfusca /5. hryoniha Aeh. Meth. (1803) p. 167. Pertusaria macrospora Hepp, Mudd, Man. p. 277. Looks almost a state of Lecanora epibrya, but is very different in the structure of the fruit and the form of the spermatia. The apothecia, which are at first pale, are in our few specimens at times somewhat crowded. It is one of our rarest
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectlichens, bookyear1894
