444 SUMMARY OF CURRENT RESEARCHES RELATING TO 



S. Taraxaci led to the conclusion that it is nearly or quite confined to 

 species belonging to the genus Taraxacum as host-plants. It appears 

 to be a sharply differentiated species, both physiologically and morpho- 

 logically. The last portion of the paper treats of Cladochytrium 

 Menyanthis, and the mode of formation of its resting-spores. 



Parasitic Fungi. — A. von Jaczewski * finds, on the branches of 

 species of Casuarina, a parasitic fungus which he identifies with Botryo- 

 sporium diffusum. 



G. Delacroix y describes a conidial form of Guignardia Bidwellii, 

 the fungus which produces the black-rot in grapes, found both on the 

 sclerotes and on the pycnids or spermogones ; it may be regarded as a 

 Verticillium, or rather as an Acrocylindrium form. 



Dr. L. Montemartini J gives an account of the injury inflicted on 

 fruit-trees by 3Ionilia fructigena, and prescribes the best remedies. 



Dr. C. v. Tubeuf § makes an important contribution to our know- 

 ledge of the parasitic fungi which attack trees, in the following points : — 

 The so-called " Schutte-lcrankheit," which is very destructive to many 

 species of conifers, is due to fungi belonging to the family Hysteriaceas, 

 especially to species of Lophodermium, Hypoderma, and Hypodermella. 

 The injuries inflicted by Lopliodermum pinastri are especially described 

 in detail. A species of Fusoma (i* 1 . blasticola = parasitica) is destructive 

 to conifer seedlings. Tuberculina maxima, belonging to the Ustilaginefe, 

 is parasitic on the Uredineee parasites of conifers. Peridermium Strobi, 

 a parasite of the Weymouth pine, was successfully cultivated on various 

 species of Bibes. JEtcidium sirobilinum was determined to be the aecidio- 

 form of Puccinastrum Padi. Gymnosporangium juniperinum belongs to 

 the cycle of Boestelia cornuta on Sorbus Aucaparia and Amelanchier 

 rotundifolia ; G. tremelloides to that of P. penicillata on Pyrus Malm, 

 Sorbus Aria, and S. cliamsemespilus. The author believes that the 

 wind has much more to do with the dissemination of the spores of 

 parasitic fungi than has generally been supposed. 



A disease of apricots in Italy and the South of France, known as 

 eczema empetiginoso, is attributed by R. Farneti || to a fungus belonging 

 to the Hyphomycetes, which he describes as a new species under the 

 name Stigmina Briosiana sp. n. 



On a new species of Melampsora, M. paradoxa, parasitic on a willow, 

 P. Dietel If finds a peculiar kind of teleutospore, hitherto undescribed, 

 usually 1-, but occasionally 3-4-celled, characterised by the peculiarity 

 of being formed singly, instead of, as is usually the case, in groups or 

 layers. 



Parasitic on the lucerne, and on Medicago falcata in N. Italy, G. 

 Pollacci ** finds a destructive parasitic fungus, Pleosphserulina Briosiana 

 sp. n. 



* Zeitsehr. f. Pflanzenkrankheiten, x. (1900) p. 146. See Bot. Centralbl., lxxxv. 

 (1901) p. 52. t Comptes Rendus, cxxxii. (1901) pp. 863-4. 



% Rev. Pat, Veg., viii. (1901) pp. 210-8. 



§ Land- u. Forstwirthsch. k. Gesundheitsamte, ii. (1901) pp. 1-17S (7 pis. and 

 •numerous tigs.). See Hedwigia, xl. (1901) Beibl., pp. 9-11. 



II Atti 1st. Bot. Univ. Pavia, vii. (1900) p. 9 (1 pi.). See Bot. Centralbl., lxxxv. 

 (1901) p. 405. f Hedwigia, xl. (1901) Beibl., pp. 32-5 (10 figs.). 



** Atti 1st. Bot. Univ. Pavia, 1901, 5 pp. and 1 pi. See Hedwigia, xl. (1901) 

 Beibl., p. 47. 



