76 SUMMAKY OF CURRENT RESEARCHES RELATING TO 



exception of two species, uredospores and teleutospores have both been re- 

 corded. No ascidia have been found, but on several acacias spermogonia 

 have been noted. The writer describes 7 species belonging to the new 

 genus. The development of the spores is traced, and they are compared 

 and contrasted with the spores of Uromyces and Ravenelia. The writer 

 thinks that the function of the sterile cysts is one of adhesion. They 

 are gelatinous, and would aid in fixing the spore on the leaf until 

 germination took place. The uredospores are borne singly ; they are 

 larger than the teleutospores, and have several germ-pores. There are 

 no paraphyses. 



Plant Diseases.* — G. P. Clinton in his botanical report describes 

 first of all the fungal diseases that occurred in Connecticut during the 

 preceding year, especially on cultivated plants. He devotes a section to 

 the discussion of Peronoplasmopara cubensis, the blight of musk melons 

 and cucumbers. It attacks all species of Cucurbitacege, and is of wide 

 distribution. A third section deals with Phytophthora infestans. 



A case of conifer disease f is recorded from Yorkshire, caused by 

 Herpolrichia nigra. The leaves are attacked and killed ; the fruits of 

 the fungus and small sclerotia are developed on the leaves. 



A new disease of potatoes % has been noted, due to Sphmrella tabifica, 

 already recorded as doing damage to beets and turnips. The leaves are 

 attacked first, then the mycelium passes down the stem and enters the 

 tubers. 



Ewert § gives advice as to combating the fungus Glo&osporium 

 Ribis. The disease follows usually on dry hot weather, and attacks the 

 oldest leaves. Pruning to encourage a new and vigorous growth is of 

 advantage ; the selection of immune varieties and the use of fungicides 

 are also recommended. 



In a further paper, Ewert j| describes an attack on roses by the rust 

 Phragmidium subcorticium. A damp season was distinctly favourable to 

 the growth of the fungus. He describes the varieties that were able to 

 resist the parasite. 



C. Brick^f records disease of cherry trees in the Rhine country, and 

 gives as the cause the fungus Cytospora rubescens which acts on the tree 

 in much the same way as Nectria cinnabarina, causing gummosis. 

 Removal and burning of diseased branches, protection of wounds by tar, 

 and supply of water to the trees in dry seasons, are recommended. 

 Fungicides are of no avail. 



F. W. Neger** has made a series of notes on timber-infesting fungi. 

 At Mariental, near Eisenach, he found many hornbeams of which the 



* Rep. Conn. Agric. Exper. Stat., 1904 (May 1905) pp. 311-84 (pis. 18-37). See 

 also Ann. Mycol., iii. (1905) pp. 372-3. 



t Journ. Board of Agric, xii. (1905) pp. 177-8. 



1 Tom. cit., pp. 37-8. 



§ Naturw. Zeitscbr. Land. Forstw., iii. (1905) p. 200. See also Bot. Centralbl., 

 xcix. (1905) p. 405. 



|| Tom. cit., pp. 249-52. See also Bot. Centralbl., xcix. (1905) p. 405. 



^ Verh. Naturw. Ver. Hamburg, 1904 (1905) pp. 66-7. See also Ann. Mycol., 

 iii. (1905) p. 381. 



** Pestscbr. zur Feier 75 J'ahreg. Besteb. Forstlebr. Eisenacb, 1905, pp. 86-98. 

 See also Ann. Mycol., iii. (1905) pp. 381-2. 



