. A monograph of lichens found in Britain; being a descriptive catalogue of the species in the herbarium of the British Museum. Lichens. SCniZOMA.] 39 towards the extremities. In Journ. Bot. 1874,1, c, it was observed that this species probably constituted a separate genus, though, as neither form of fructification was then known, it might be retained as an anomalous section of Collema. I have since detected the spermogones in Great Britain, and I hope the apothecia may be also discovered. The de- scription of the thallus of Collema radiatum Somnl. (possibly an Ompha- laria) and its habitat gi
. A monograph of lichens found in Britain; being a descriptive catalogue of the species in the herbarium of the British Museum. Lichens. SCniZOMA.] 39 towards the extremities. In Journ. Bot. 1874,1, c, it was observed that this species probably constituted a separate genus, though, as neither form of fructification was then known, it might be retained as an anomalous section of Collema. I have since detected the spermogones in Great Britain, and I hope the apothecia may be also discovered. The de- scription of the thallus of Collema radiatum Somnl. (possibly an Ompha- laria) and its habitat given by Sommerfelt, Lapp. p. 121, as well as the account of its internal structure and of the spermogones given by Fr. fil., Lich. Arct. p. 288, do not at all correspond with our plant; the two can- not be identical. On the thallus is rarely seen a parasitic fnngus, viz. Sphcsria schizomatis-Cromb., which must not be mistaken for the apothecia. Hob. On decayed mosses and the ground in crevices of rocks in alpine places.—Distr. Extremely local, being confined apparently to one or two of the S. Grampians, Scotland.—: Ben Lawera and Craig Calliach, Perthshire. 14. COLLEMA Wigg. Prim. Fl. Hols. (1780) p. 89; Nyl. Mem. Soc. So. Nat. Cherb. iii. (1855) p. 164.—Thallus usually orbicular or suborbicular, membranaoeo-lobed, very rarely squamu- lose or granulose; gonimia moniliform, cortical layer not discrete. Apothecia lecanorine ; spores Suae, simple or generally multilo- cular, colourless ; hymenial gelatine usually bluish, rarely wine-red with iodine. Spermogones more or less immersed, sterigmafca shortly articulate, rarely simple; spermafcia straight, obtusely in- crassate at either apex. As now limited, this genus is more compact than formerly, though it still includes several species, diverse in thallus and fructification, as will be seen from the following sections. These differences, however, are not of suiEcient importance to warrant its division into several genera.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectlichens, bookyear1894
