. A monograph of lichens found in Britain; being a descriptive catalogue of the species in the herbarium of the British Museum. Lichens. LECANOEA.] LECANO-LECIDEEI. 349 A large genus comprising several subgenera, formerly ranking as distinct genera, but not sufficiently differing to warrant this arrangement. Indeed, so intimately are they related that Nylander seems at times in- clined to regard them as only leading sections. Some of these with bia- toroid apothecia have sometimes been arranged under the Lecideei; but in most cases the apothecia are, at least in a young state, lecanorine, with
. A monograph of lichens found in Britain; being a descriptive catalogue of the species in the herbarium of the British Museum. Lichens. LECANOEA.] LECANO-LECIDEEI. 349 A large genus comprising several subgenera, formerly ranking as distinct genera, but not sufficiently differing to warrant this arrangement. Indeed, so intimately are they related that Nylander seems at times in- clined to regard them as only leading sections. Some of these with bia- toroid apothecia have sometimes been arranged under the Lecideei; but in most cases the apothecia are, at least in a young state, lecanorine, with the margin containing gonidia. In other instances the character of the spermogones indicates their true relation. Subgenus 1. PSOROMA Nyl. Not. Sallsk. pro F. et PI. F. Forh. V. (1886) p. 126.—Thallus squamulose or subgranulose, internally cellular. Apothecia lecanorine; spores Bnie, ellipsoid, simple ; hymenial gelatine bluish, then wine-red with iodine. Spermogones with jointed sterigmata and short cylindrical spermatia slightly thickened at either —Psoroma Ach. Prodr. (1798) p. 91 pro minima parte ; Nyl. Mem. Soc. Cherb. iii. (1885) p. 322. At once distinguished by the entirely cellular structure of the thallus. Most of the species are exotic, and of the few which are European, only one occm's in this Fig. 58. Lecanora {Fsoroma) hypnonim —a. Vertical section of thallus, x200. b. Spores, x500. v. Sterigmata and spermatia, x500. 1. L. hypnonun ich. Syn. (1814) p. 193; N"yl. Not. Sallsk. pro F. et Fl. F. Forh. v. (1866) p. 125.—Thallus indeterminate, squa- muloso-granulate, yellowish-brown or tawny-yellow; squamules minute, crenate or granulate (K'—). Apothecia moderate or some- what large, at first urceolate, then plane, red or brownish, the thai- line margin granuloso-crenate; spores often somewhat acute at either apex, 0,016-21 mm. long, 0,008-11 mm. thick; hymenial gelatine bluish, then wine-red with iodine.—Cromb. GreviUea, xii. p. 60
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectlichens, bookyear1894
