ZOOLOGY AND BOTANY, MICKOSOOPY, ETC. 245 



include No. 87, " The Die-back (Cytospora) Disease of Fruit-trees," 

 that attacks the branches; No. 120, "Peach Leaf -curl" {Exoascus 

 deformans) ; No. 133, " Powdery Mildew of the Yine" {Uncinula necator), 

 a 'leaf disease; No. 164, "Potato Leaf -curl," the origin of which is 

 obscure ; No. 195, " American Gooseberry Mildew " {Sphserotheca Mors- 

 iwse), a ruildew which attacks leaves and branches ; No. 242, " Stripe 

 Disease of Tomatoes," due to a bacillus ; No. 271, " Clover Stem- 

 rot " (Sderotmia trifoUorum) ; No. 302, " Silver Leaf in Fruit-trees," 

 generally caused by Stereum purpureum ; and No. 345, " The White-rot 

 Disease of Onion Bulbs," distinguished by the white mycelium on the 

 bulbs. The last-mentioned is a new publication. All of the leaflets 

 are illustrated, and with the description of the disease certain instruc- 

 tions are sfiven how best to combat it. A. L. S, 



Lichens. 



Short History of Lichenology.— Charles C. Plitt (Bryologlst, 

 1919, 22, 77-85). An account is given of lichens in botanical literature 

 from the earliest references onwards. The advance of knowledge con- 

 cerning these plants is also outlined with reference to their structure and 

 to the development of the fructifications. The author gives quotations 

 from various lichenologists who have held strong views on the nature 

 and autonomy of lichens. A. Lorrain Smith. 



Schedulae of Lichenes Ticinenses Exsic— Const. Mereschkovsky 

 (Ann. Conserv. Jard. Bot. Geneve, 1919, 21, 145-216). The author 

 publishes here descriptions and notes on some 120 species. They have 

 been collected and issued to complete another collection which he had 

 undertaken, but of which much of the material had to be abandoned in 

 Kazan. A. L. S. 



Lichens from Transcaucasia. — J. Steiner {Ann. Mycol., 1919, 17, 

 1-32). A large series of lichens sent by Woronoff to Steiner have been 

 determined. There are a number of new species. The greater number 

 are common European species. Steiner remarks on the number of 

 Central European forms, and also notes the abundance of Lecanorse 

 rather than Lecidese, with the great lack of Verrucarise. He considers 

 that certain lichens may be found in a narrow belt all round the world. 



A. L. S. 



Supplemental Report on the Lichens of Epping Forest.— R. 

 Paulson and Percy G. Thompson {Essex Naturalist, 1919, 19, 27-30). 

 The authors have added about twenty species, varieties or forms to the 

 lists of present-day Hchens in Epping Forest published by them in 1911 

 and 1913. The total record of lichens from the locality is now 127. 



A. L. S. 



Lichens of the Baslow Foray.— A. Lorrain Smith {Trans. Brit. 

 Mycol. Soc, 1920, 6, 252). A short account of lichens found at or near 

 Baslow. The district is affected by the smoke of Sheffield, and the 

 lichen vegetation is not abundant. A. L. S. 



