206 SUMMARY OF CURRENT RESEARCHES RELATING TO 



clovers, thistles, etc. Mc Alpine gives a description of the fungus, 

 which he places in the genus Hypochnus. 



H. and P. Sjdow * add a note to the above paper, to the effect that 

 the genus Hypochnus is not a good genus, and that this fungus would 

 fall into the genus Epithele, and so it is re-named Epithele fuciformis. 



Diseases of Plants. — J. B. Dandeno f describes a disease of green- 

 house liOttuce due to the fungus Didymaria perforans, previously 

 classified as Marsonia perforans. 



Georg SchikorraJ has investigated a disease causing the destruction 

 of LeguminosjB. It is caused by a species of Fusarium, that lives as a 

 saprophyte on any remains of the ])lants, or even in the soil. It enters 

 the living plant by a wound, and quickly destroys the cellulose. Warm 

 moist weather is especially favourable to the spread of the fungus. 



Georges Delacroix § describes a disease of the poplar {Fopulus 

 canadensis), which causes the death of branches on the young trees and 

 sometimes destroys the whole tree. This species of poplar is largely 

 cultivated in the south of France, the wood being used to make cases 

 for fruits and vegetables. The disease has been diagnosed to be due to 

 a pycnidial fungus, Dothkhiza popuJea, a wound parasite. It forms its 

 fruits under the periderm : the mycelium is both inter- and intra-cellular, 

 and it is more abundant in the cortex than in the wood, though it is 

 often enough found in the vessels. Delacroix recommends careful 

 burning of the dead branches, spraying the young plants with Bordeaux 

 mixture, and the sterilisation (where possible) of all wounds. 



P. Gueguen || examined a number of diseased Marguerites, and found 

 that they were attacked at the " neck " by a fungus that formed minute 

 sclerotia in the tissue of the host, and was visible as little black dots 

 under the epidermis. The sclerotia were cultivated in artificial media, 

 and a conidial form was obtained, a new species of Acrostalagmus. 



W. A. MuiTill IF finds that very serious damage is done to living 

 trees of Castanea dentata by a fungus, Diaporthe parasitica sp. n. It is 

 a wound parasite, and will attack any part of the tree, gradually girdling 

 and killing the branches or stem. The only method of cure is to prune 

 out the diseased parts. 



Pathological Fungi.** — M. E. Pinoy has been experimenting 

 recently with fungi that produce myectomy. From a case where the 

 fungus in question was white, and had been referred to Streptothrix 

 mycetomi, he took a portion and inoculated a pigeon. A swelling was 

 induced, and on it a growth of Sterigmatocystis nidulans, a dark-coloured 

 form. The author thinks that probably the same fungus is accountable 

 for all the cases recorded. 



* Ann. Mvcol. iv. (1906) p. 551. 



t Mich. Ac. Sc, viii. (1906) p. 45. See also Bot. Centralbl., civ. (1907) p. 16. 



% Inaug. Diss., Berlin (1906), 34 pp. See also Centralbl. Bakt., xvii. (1906) 

 pp. 577-8. 



§ Bull. Soc. Mycol. France, xxii. (1906) pp. 239-52 (1 pi.). 



11 Tom. cit., pp. 254-65 (1 pi.). 



^ Torreya, vi. (1906) pp. 186-9. See also Bot. Centralbl., civ. (1907) p. 122. 



♦* Comptes Rendus, cxliii. (1906) pp. 1175-6. 



