250 Pflanzenkrankheiten. — Bacteriologie. — Lichenes. 



South, F. W., Further Notes on the Fungus Parasites of 

 Scale Insects. (West Indian ßull. XII. 4. p. 403—412. 1912.) 



A continuation of the paper abstracted above. It consists of the 

 results of regularly conducted observations. Several additional spe- 

 cies of fungi have been noted, but the four alluded to are the most 

 useful. The author states that the fungi are certainly more useful 

 in Dominica and St. Lucia (islands with a high rainfall) than 

 in Montserrat and Antigua where the rainfall is Iower. 



A. D. Cotton. 



Johnson, J. C, On well-marked aerotropic growths of 

 Bacillus megatherium. (Ann. Bot. XXVI. p. 949— 950T July 1912.) 



The author has for some time past noted the appearance of 

 aerotropic growths in Bacillus megatheriuni. This is an unusual 

 occurrence except in the Myxobacteriaceae described by Th axter. 

 It is hoped to record any such growths which may seem to connect 

 the ordinary free living bacteria with the Myxobacteriaceae. 



M. L. Green (Kew). 



Bachmann, F. M., A new type of Spermogonium and Fer- 

 tilisation in Collema. (Ann. Bot. XXVI. p. 747 — 760. pl. 69. July 

 1912.) 



The authoress describes in Collema pulposum the occurrence of 

 functional spermatia below the surface of the thallus and attached 

 in small numbers to hyphae. The trichogynes also do not reach the 

 surface but grow towards the spermatia and fusion takes place. 

 This fusion is followed by the changes in the trichog3^ne and asco- 

 gone already described by several investigators. 



O. V. Darbishire. 



Horwood, A. R., A hand-list of the Lichens of Great 

 Britain. Ireland, and the Channel Islands. (Comp. Lieh. 

 Exch. Club Brit. Isles. Dulau & Co. Soho Square, London W. 1912.) 



This is a list, including 142 genera and 1259 species, of British 

 Lichens. It is based mainly on the recentlv completed Monograph 

 of British Lichens. The species of the genus Lecanora have however 

 been re-arranged and the position of some other genera has been 

 altered. O. V^ Darbishire. 



Smith, A. L., A monograph of the British Lichens. A 

 Descriptive Catalogue of the species in the Depart- 

 ment of Botany, British Museum. Part II. (409 pp. 59 pl. 

 1911. Longmans & Co. Price £ 1.) 



The second part of Crombie's Monograph of British Lichens 

 has been prepared by Miss A. Lorrain Smith. It deals with the 

 whole of the Lecideaceae, the Graphidei, and the Pyrenocarpi. The 

 clas.sification of the concluding voIume follows for the most part the 

 main lines projected in the first. The "natural orders" under which 

 the genera are classified correspond with the "Families" recognised 

 by Zahlbruckner in Engler and Prantl's Pfianzenfamilien. 



Modern views are adopted with regard to the division of the 

 Lecideaceae, a course which necessitated a careful revision of this 

 difücult Order. Several new combinations were found necessary, and 



