ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 437 



may enter the flower of the cotton-plant and so cause disease of the bolls. 

 He describes the development of the fungus and the way in which the 

 boll was affected. It is not claimed that this is the usual mode of 

 attack by the fungus. 



W. Howard Rankin * has made a study of the root-rot of Ginseng. 

 The disease was evident by the blackened and dead condition of the 

 roots. By means of artificial cultures a rhizoctonia-like mycelium was 

 developed, and a growth of branching conidiophores with minute globose 

 conidia. In the spring of the following year Sderotmia apothecia 

 were found on two black-rotted roots, and have been described as S. 

 Panicis sp. n. 



F. D. Heald and I. M. Lewis f have studied a blight of Mesquite 

 (Prosopis fflandidosa). The disease was very abundant in Texas. It 

 affects the leaves, giving them a rusted appearance, due to the presence 

 of golden yellow pycnidia, which the authors have placed in a new 

 genus and species, Scleropycnium auremn. The conidia are simple, colour- 

 less, and narrowly cylindrical. The fungus is one of the NectrioidacejB. 



Jokob Eriksson J has examined and described a disease of elm 

 seedlings due to a new fungus, Exosporium Ulnii. The fungus was 

 subsequently found on older trees in the near neighbourhood. The 

 diseased plants were dead or dying from the apex, and on the killed 

 branchlets were found the pustules of the fungus, a Hyphomycete of the 

 Tubercularige Dematiete group. It attacks the small lateral branches 

 first, and then penetrates the main axis. Eriksson recommends careful 

 watching of the plants, and the pruning and destroying of any branches 

 that show disease. 



A book by the same author § on Fungoid Diseases of Agricultural 

 Plants has recently been translated into English by Anna Molander. 

 More than 200 different diseases are treated, and the system followed is 

 entirely fungological, each family that causes disease being dealt with in 

 separate chapters from Bacteria to Hyphomycetes. Several diseases, of 

 which the cause is unknown, have also been described, diseases of 

 potato, tobacco, etc. A chapter is devoted to general protective mea- 

 sures, and many hints are scattered through the book as to the best 

 method of checking or stamping out particular diseases. The book is 

 very fully illustrated. 



A. Potebnia || has described a new canker-forming fungus on apple 

 trees, which appeared in a garden at Charkow. He has referred it to 

 Phacidiella discolor, and the pycnidial form which is often present, to 

 Phacidiopycnis malorum g. et sp. n. It forms wounds in the branches, 

 and finally kills them ; the stroma-like fungus forms pycnidia, and 

 later apothecia. Potebnia made numerous artificial cultures, which are 

 described. 



W. R. Collinge IF reported on a serious outbreak of disease in a 



* Phytopathology, ii. (1912) pp. 28-31 (1 pi.). 



t Trans. Ainer. Micr. See, xxxi. (1912) pp. 5-10 (1 pi.). 



+ Mycol. Centralbl., i. (1912) pp. 35-42 (1 pi.). 



§ Fungoid Diseases of Agricultural Plants. London : Bailliere, Tindall, and 

 Cox (1912) ix. and 208 pp. (117 figs., 3 col.). 



II Zeitschr. Pfianzenkr., xxii. (1912) pp. 129-48 (3 pis.), 



i 2nd Rep. Econ. Biol. Birmingham (1912) pp. 46-7. 



