ZOOLOGY AND BOTANY, MICKOSCOPY, ETC. 285' 



latter turns dark, the dark colour in both the new species is due to 

 chlamjdospores with very dark walls. No higher form was found for 

 these species. A. L. S. 



British Mycolog'y : The Selby Foray. — The twenty-second annual 

 week's Fungus Foray was held at Selby in September, 1918. An 

 account of the work done during the meeting is given by the Secretary, 

 M. Wakefield {Trans. Brit. Mycol. Soc, 1919, 6, 77-87, 1 pi). A 

 dry season had hindered the growth of the fungi, but a large and 

 interesting collection was made. No new species were discovered, but 

 four fungi new to Britain were obtained : Hypochmis umbriniis. H. 

 isaheUinus, GalacUnia ffowsei iwiA Zythia mercurial is. The Presidential 

 Address (pp. 91-103) was given by the Rev. David Paul, and dealt 

 with the earlier study of fungi in Britain. The' earliest mention ef 

 these plants occurs in the " Greate Herball," in 1506. Other Herbals 

 also as a rule took some note of fungi. The gradual building up of 

 the science, with special reference to field-work, is traced down to the 

 time of Berkeley, " whose ' Outlines ' settled for mycologists the system 

 of classification of the higher fungi." A. L. S. 



Ecological Diversity and Generic Coefficients. — J. Dufeenoy 

 {Bull. Soc. Mycol. France, 1919, 35, 27-46). This subject had been 

 worked out for the Phanerogams by jaccard, who found that in regions 

 with little ecological variation the numbers of genera in comparison 

 with species was very high. Dufrenoy finds that the same calculation 

 holds good for Cryptogams. Thus on sea-dunes ;he found 3 genera 

 with 3 species giving 100 p.c. ; on dunes at Arcachon, 10 genera with 

 11 species, 90 p.c. ; and on dunes at Pinada, 11 genera with 12 species, 

 also 90 p.c. The generic coefficient for Phanerogams in these same 

 localities was also 90 p.c. Many other ecological districts are reviewed. 

 Where there is more variation in the ecology of any given area, the 

 percentage is much smaller. A. L. S. 



Cave Fungi.— .J. Lagarde {Arch. Zool. Exper., 1913, 53, 277-307, 

 2 pi., 8 figs. : 1917, 56, 279-314, 2 pi. (1 col.), 2 figs.). 'These papers 

 form part of a series entitled " Biospeologica," which take into account 

 the organisms found in subterranean situations. The author finds that 

 the absence of light and the abnormal conditions of humidity and tem- 

 perature had exercised considerable influence on the development of the 

 fungi collected from many difl'erent caves. He records one Mycetozoon, 

 Arcyria nutans, and one Phycomycete, Mucor sp. ; the other forms 

 examined belong to the Ascomycetes, Basidiomycetes and Hyj)homycetes. 

 Among the latter are a number of species of Isaria, which were mostly 

 found on insects. He has established a new genus, Mahevia, for a 

 species which he had first placed under Isaria yuignardii Mahew ; he 

 distinguishes it from Isaria on account of a central sterile stalk. Another 

 new genus and species,- Corallinopsis pilulifera, which grew on various 

 Goleoptera, belongs to the Phagostilbacese. Several new species are 

 described belonging to different genera. A. L. S. 



