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 these by monochromatic sun- 

 light mchnes me to the opinion that Hartnack's interpretation 

 IS erroneous, and that the fine striaj 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- 

 po\yer to that I used, or if the illumination was unsuitable. 

 1 his memorandum is accompanied by two photographs exhi- 

 biting what I saw; one is magnified 1034, the other 3100 

 diameters. The principal frustule shown in these photographs 

 is -jJ-^ of an inch in length (the mean length of S. gemma is 

 stated in the ' Micrographic Dictionary ' as ^4-,- of an inch) . The 

 line transverse strias counted longitudinally at the rate of 72 

 Jo the -rsVo of an inch. Transversely these were resolved into 

 beaded appearances which counted laterally 84 to the toV-o of an 

 inch. If the structure consists, as I suppose it does, of fine 

 hemispherical bosses projecting from the surface of the frus- 

 tules, the fact that these bosses are set together more closely 

 m 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. 



I have also resolved this diatom by monochromatic light 

 derived from the electric lamp. The appearances obtained 

 were identical with those above described. 



lAll. — Notices of British Fungi. By the Rev. M J 

 Beekeley, M.A., F.L.S., and C. E. Broome, Esq , 

 F.L.S. 



[Continued from vol. vi. p. 469.] 



[Plates XVIII., XIX., XX., & XXL] 



^ Coiyrimis fuscescens, Fr. Ep. 244. 



This species, introduced on the authority of a drawing by 

 Lady Orde, has been found lately at Walthamstow. 



1263. Cortinarius (Phlegmacium) triumphans, Fr. En 

 p. 256. ' 1 y 1- 



C. sublanatus, Hussey, seems to be a form of this species. 



1264. C. (Phlegmacium) rnssus, Fr. Ep. p. 261 : Trans. 

 Woolh. CI. 1870, t. 1. f I , 



In moist woods, W. G. Smith. 

 Ann. & Mag. N. Hist. Ser. 4. ToZ. vii. 31 



