Rev. M.J. Berkeley & :Mr. C. E. Broome on British Fungi. 425 Army Medical Museum, a few months since, from Bourgogne of Paris. A careful study of tli^se by monochromatic sun-light inclines me to the opinion that Hartnack's interpretation is erroneous, and that the line striae are in reality rows of mi-nute hemispherical bosses, from which, as in the case of other diatoms, the appearance of hexagons would readily result if the frustule was observed by an objective of inferior defining-power to that I used, or if the illumination was unsuitable. This memorandum is accompanied by two photograjihs exhi-biting what I saw ; one is magnified 1034, the other 3100 diameters. The principal frustule shown in these photographs is ^o of an inch in length (the mean length of 8. gemma is stated in the ' Micrographic Dictionary ' as -5^-0 of ^"^ inch) . The fine transverse striai counted longitudinally at the rate of 72 to the T-oVo of ^ii inch. Transversely these were resolved into beaded appearances which counted laterally 84 to the toVo of an inch. If the structure consists, as I suppose it does, of fine hemispherical bosses projecting from the surface of the frus-tulcs, the fact that these bosses are set together more closely in the transverse direction than in the longitudinal would account for the elongated form of the pseudohexagons when seen. Some parts of the photographs closely approach Hartnack's description, but it is easy to observe that these are not the parts which are most nearly in focus. 1 have also resolved this diatom by monochromatic light derived from the electric lamp. The appearances obtained were identical with those above described. LIII. — Notices of British Fungi. By the Rev. M. J. Berkeley, M.A., F.L.S., and C. E. Broome, Esq., F.L.S. [Continued fi-om vol. vi. p.*469.] [Plates XVIII., XIX., XX., & XXL] * Coprinus fuscescens, Fr. Ep. 244. This species, introduced on the authority of a drawing by Lady Orde, has been found lately at Walthamstow. 1263. Cortinarivs (Phlcgmacium) friumjJians^ Fr. Ep. p. 256. C. suhlanatuSj Hussey, seems to be a form of this sj)ecics. 1264. C. (Phlcgmacium) n/ssus, Fr. Ep. p. 261 ; Trans. Woolh. 91. 1870, t 1. In moist woods, W. G. Smith. Ann. d: Mag. N. Hist. Scr. 4. Vol\\\. 31
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