Algae. — Pflanzenkrankheiten. 645 



Thuret: A question of Nomenclature. (Journ. Linn. Soc. 

 Bot. IXL. p. 105—119. pl. 9 and 3 figs. in text. 1909.) 



The author here sets forth his views as to the correctness of 

 nomenclature for this species, on which point he differs from Mons. 

 Sauvageau. The latter author is of opinion that we do not know 

 enough of F. spiralis L. to enable us to define the species with 

 certaint}^ and he holds that it includes different forms of F. vesicu- 

 losiis e. g. F. vesiculostts f. sphaerocarpa. Dr. Börgesen on the other 

 hand keeps to the views which he described in his Botany of the 

 Faeroes, namely that the diagnosis of Linnaeus is quite clear 

 enough to leave no doubt as to the identity of F. spiralis, and he 

 further considers his contention is supported by an examination of 

 the specimens in Linne's herbarium in London. 



These speciraens are reproduced in photographs in the present 

 paper, and are described in detail. The differences which induced 

 Thuret to regard his F. platycarpiis as a distinct species are, accor- 

 ding to Börgesen, nothing but modifications according to the locality 

 in which F. spiralis grows. Specimens of Faeroese material of F. 

 spiralis have characters resembling those of F. platycarpiis; and his 

 opinion is that Thuret's F. platycarpiis is a more southerly variety 

 of F. spiralis, while the typical form occurs more particularly in the 

 northern regions, but may also be found growing together with 

 var. platycarpa in the southern. Prof Sauvageau in short thinks 

 that the name of this plant ought to be F. platycarpiis Thur. with 

 var. spiralis Sauv.; while Dr. Börgesen maintains it should be F. 

 spiralis L., with var. platycarpa (Thur.) Borgs. The views of authors 

 on the validity of F. spiralis, from Gmelin and Hudson onw^ards, 

 are reviewed. Finally the author contends to have proved that we ought 

 to write F. spiralis L., as the name of the species, with the varieties: 



Var. typica, Borgs. (=: f. typica, Borgs.), with f. limitanea (Mont.) 

 ^ f. nana, Kjellman (Borgs.); and Var. platycarpa (Thur.), Borgs. 



E. S. Gepp. 



Cotton, A. D., Marine al^aeof the West oflreland. (Bull, 

 of Mise. Inf. Roy. Bot. Gard'ens, Kew. VII. p. 312—315. 1909.) 

 This paper consists of a brief sketch of the survey which is 

 being made of Cläre Island and the adjoining mainland in the 

 county of Mayo. The survey will extend over a period of two or 

 three years, and will be carried out under the leadership of Mr. R. 

 Llyod Praeger by means of monthly trips. From the point of 

 View of marine algae, the locality is füll of interest, and the author 

 gives a brief description of the area and the types of collecting 

 ground present. Most types appear to be represented, the exposed, 

 the sheltered, the brackish water, rocky, sandy, and muddy ground. 

 On Cläre Island the condilions dependent upon temperature and 

 salinity of water, and the physical nature of the coast, are fairly 

 uniform, and the distribution of the algae and algal associations 

 appear to be principally affected by conditions of illumination, 

 desiccation, and exposure to waves and rough water. Special locali- 

 ties are mentioned as representing certain types of collecting ground. 



E. S. Gepp. 



Kirchner, O. v. Die Mehltaukrankheit der Eichen. (Allg. 



Forst- und Jagdztg. Mai 1909. p. 158 ff.) 

 Kirchner, O. v. Das Auftreten des Eichenmehltaues in 



