. A monograph of lichens found in Britain; being a descriptive catalogue of the species in the herbarium of the British Museum. Lichens. 512 LICHEN ACEI. [PHXTCTIS,. Kg. 72. Phlyctis agdma Koerb, -A. A2- or murali-divided. Spermogones with simple or slightly branched sterigmata. Difeers from the preceding subtribe in the apothecia being usually more open, and especially in the spores being murali-divided. It comprises 7 genera, four of which are entirely exotic, while Belonia Koerb., though European, does not occur in Britain. 64. PHLYCTIS Wallr. Naturg. der Eleoht. (1825) p. 527.—ThaUus thinl
. A monograph of lichens found in Britain; being a descriptive catalogue of the species in the herbarium of the British Museum. Lichens. 512 LICHEN ACEI. [PHXTCTIS,. Kg. 72. Phlyctis agdma Koerb, -A. A2- or murali-divided. Spermogones with simple or slightly branched sterigmata. Difeers from the preceding subtribe in the apothecia being usually more open, and especially in the spores being murali-divided. It comprises 7 genera, four of which are entirely exotic, while Belonia Koerb., though European, does not occur in Britain. 64. PHLYCTIS Wallr. Naturg. der Eleoht. (1825) p. 527.—ThaUus thinly crustaceous, continuous or pulverulent. Apothecia rotundato- difform, usually suffused, erumpent, the thaUine margin irregularly dehiscent or indistinct; hypo- theeium colourless; spores large, l-2n8e, ellipsoid or oblong, murali- divided, colourless; paraphyses slender ; hymenial gelatine scarcely tinged, but the thecae bluish with iodine. Spermogones with simple sterigmata and short, slender, straight sperm atia. A small genus the plants belonging to which are, from the appearance of the fructification, readily overlooked. In some respects it approaches Pertu- saria, but is definitely separated by the muriform spores. European species two are found in this country. 1. P. agelsea Koerb. Syst. Lich. Germ. (1855) p. 391.—Thallus effuse or subdeterminate, thin, rugose or smoothish, often subleprose, white or greyish-white (K +yellow, then deep-red). Apothecia minute, blackish, white- or csesio-suffused; spores 2n8e (3-4n8B), ellipsoid, mucronate at the apices, 0,045-70 mm. long, 0,014-27 mm. thick.—Mudd, Man. p. 279, t. 5. f. 118; Cromb. Lich. Brit, p. 61; Leight. Lich. PL p. 246, ed. 3, p. 237.—Thelotrema agelcea Gray, Nat. Arr. i. p. 494 pro parte. Variolaria agelcea Turn. & Borr. Lich. Brit. p. 78 ; Sm. Eng. El. v. p. 171. Lichen agelaiis Ach. Prodr. (1798) p. 30; Eng. Bot. t. 1730. Variolaria eon- stellata Tayl. in Mack. PL Hib. ii. p. 113 pro parte (ex specimiu
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectlichens, bookyear1894
