. A monograph of lichens found in Britain; being a descriptive catalogue of the species in the herbarium of the British Museum. Lichens. 182 LICHENACEI. [koccella. 34. EOCCELLA DC. Fl, Fr. ii. (1805) p. 331.—Thallns sub- fruticulose, usually opaque and smoothish, somewhat tough, atten- uate at the apices, oon- colorous on both sides, medullar}^ layer dense. Apotheoia lateral, Icci- deine or irregiilar,naked or pruiuoso ; hypo- thecium thick, black ; spores oblong or fusi- form, straight or curved; hymcnial gelatinewine- red or vyine - yellow, or sometimes slightly bluish -with iodine. Spermogo
. A monograph of lichens found in Britain; being a descriptive catalogue of the species in the herbarium of the British Museum. Lichens. 182 LICHENACEI. [koccella. 34. EOCCELLA DC. Fl, Fr. ii. (1805) p. 331.—Thallns sub- fruticulose, usually opaque and smoothish, somewhat tough, atten- uate at the apices, oon- colorous on both sides, medullar}^ layer dense. Apotheoia lateral, Icci- deine or irregiilar,naked or pruiuoso ; hypo- thecium thick, black ; spores oblong or fusi- form, straight or curved; hymcnial gelatinewine- red or vyine - yellow, or sometimes slightly bluish -with iodine. Spermogones lateral, with acicular, ctirved spermatia. The thallus is more or less fruticulose from a common base,and in some species is of considerable size. It is wliitisli, rarely brownish, in colour, and firm, though sometimes from tenuity becoming flaccid. The cortical and gonidial systems, as ob- served by Nylander, Smi. i. p. 256 (cfr. Flora, 1806, form a confluent. Fig. 37. Boccella pkycopsis Ach.—a. Section of external portion of tlie thallus, showing the cortical and gonidial layers and a small exterior portion of the medulla, X 2U0. i- Gonidia, X 350. c. Ver- tical section of an apothecium, x30. d. Theca and parapbysis, X 350. e. Spores, X 500, /. Vertical section of a spei'mogone, X 30. ff. Sterigmata and spermatia, x500. p. 108), layer, the cortex, which is'destitute of an epithallus, consisting of medullary fllaments thickened towards the surface and there densely parallel, external to which are seen granular elements, while internally and immediately beneath the cortex are the gonidia. Tho apothecia are lecideine or variously deformed, often as in Dirina, sometimes as in Chlodecton, with the parapbyses slender or nearly moderate, and not unfrequently bifurcate. 1. R. phycopsis Ach. Lich. Univ. (1810) p. 440.—Thallus rounded or slightlj' compressed, very much branched and densely casspitose, whitish or glaucous-brown, more or less sorediiferous; branches subsimplc o
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectlichens, bookyear1894
