Transactions of the Linnean Society Volume 27 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1871 Excerpt: ...near Jakobshavn. This state, with lacinise as long and flexuous as in P. leucomela, might appropriately bear the name (if name is required) of form or variety leucomeloides. The form from Lyngemarken is decayed, and as white as P. leucomela, with a black, Verrucarioid parasite, very conspicuous on these whitened laciniae, resembling externally that which occurs on the young thallus or prothallus of Lecanora tartarea, var. frigida. The thallus of Islandica is sometimes of a beautiful vermilion colour, or is red-mottled, about the base (e. g. in Egedesminde specimens). None of its forms give any reaction with potash. Fibrillosity of the margin of the lacinise is sometimes a very marked character. The fibrillar are sometimes very long, and are split at their ends into tufts of secondary fibrillulse. The crispa forms are sometimes also very denticulate, with narrow lacinise, closely tufted, and of a very deep glossy brown colour. Some forms closely resemble, save in colour, C. cucullata. The laciniae are broader, much curled; the margins smooth, destitute of fibrillse, cilia, or spermogonia; the In the Edinb. University Herb, what is called C. Oranlandka by Despreaux, collected in Labrador in 1833, is this form of C. Islandica, with the thallus as much curled as in C. ciicullata. VOL. XXVII. 2 X extremities of the laciniae rounded; the whole plant more foliaceous and membranous; the colour more of a uniform dark olive or chestnut, becoming greener under moisture. The plant grows in dense, caespitose, dwarf masses, exactly like cucullata. This is probably the C. DSlisei, Bory, which, regarded as a separate species by Th. Fries (Arct. p. 11), is by other lichenologists referred as a mere "variety" to Islandica. It has, however, an equal title to belong ...