. A monograph of lichens found in Britain; being a descriptive catalogue of the species in the herbarium of the British Museum. Lichens. TTSITEi.] â nSNEEI. 201 Tribe X. U S N E E I Nyl. Mem. Soc. Cherb. iii. (1855) p. 170. ThaUus fruticulose, somewhat rounded, rarely angulose, erect or pendulous, internaUy with a firm chondroid axis. Apothecia leca- norine, peltate, terminal or lateral; spores Snse, small, simple, colourless ; paraphyses not discrete. Spermogones immersed; sterig- mata simple or subsimple. A natural tribe, distinguished from its allies by having internally a solid axis (as in
. A monograph of lichens found in Britain; being a descriptive catalogue of the species in the herbarium of the British Museum. Lichens. TTSITEi.] â nSNEEI. 201 Tribe X. U S N E E I Nyl. Mem. Soc. Cherb. iii. (1855) p. 170. ThaUus fruticulose, somewhat rounded, rarely angulose, erect or pendulous, internaUy with a firm chondroid axis. Apothecia leca- norine, peltate, terminal or lateral; spores Snse, small, simple, colourless ; paraphyses not discrete. Spermogones immersed; sterig- mata simple or subsimple. A natural tribe, distinguished from its allies by having internally a solid axis (as in Stereocaulori), which readily separates from the cortical layer. Comprising only three small genera, two of which, Keuropogon and Chliirea, do not occur in Great Britain, it is with us, as in most other coimtries, marked by the abundance of the species of Usnea. 37. USNEA Dill. Muse. (1741) p. 56 pro parte; Ach. Meth. (1803) p. 306.âThaUus filamentoso-elongate, or iibrilloso-ramulose with patent branches, ooncolorous on both sides ; chondroid axis composed of densely conglutinate filaments, cortical layer fragile and often diffract. Apothecia concolorous or subconcolorous with. Fig. -10. Usnea florida Ach.âa. Longitudinal section of the tballus, x200. b. Vertical section of a young apotbeciura (with thalline receptacle), x30. c. Tbeca and parapbysis, x350. d. Spores, x500. e. Transverse section of the thallus, showing above a spermogone (beneath which is a section of tbe medulla), X30. /. Sterigmata and spermatia, x500. the thallus, often with ramuloso-ciliate margin; hypothecium colour- less ; spores small, ellipsoid; paraphyses stipate in the dense hymenial gelatine, which is bluish with iodine. Spermogones lateral, slightly protuberant, in colourless conceptacles ; spermatia straight, cylindrico-acicular, slightly incrassate towards the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - colo
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectlichens, bookyear1894
