712 



the cultures of G. globosum, which were made on these apples, two plants of the 

 mountain ash {Pyrus americana) were inoculated with the same Gymnosporangium 

 in April, and having produced luxuriant spermogouia, gave abundant and well- 

 developed aecidia late in July. It may be mentioned in passing that these iBcidia 

 were not the Eccstelia cornuta which occurs on the same host further north, but 

 had all the characters of the Bastclia, which follows inoculation by G. glohosum on 

 other hosts. lu addition to the above facts it was ascertained that a rust of quinces 

 and of Keiffer pears was referable to the same source, both hitherto unrecorded hosts 

 for this species. Cultures of G. <jlobosum on hawthoru (Cratocyiis crus-galU) were also 

 repeated and produced abundant and well-developed aecidia under equally strict 

 conditions, couiirmiug the writer's previous statements in all respects. 



A brief account is given of tlie author's observations of the "bird's 

 nest" Gymnosporangium, and the new species is described as follows: 



Gyvuwsporanyium nidus-avis, n. sp.— Sporiferous masses when young, cushion- 

 like, irregularly globose or oval, small and distinct or elongate and confluent accord- 

 ing to the habitat, rich red brown, when mature indefinitely expanded by moisture, 

 orange-colored. Teleutospores two-celled, irregular in shape, broadly ovate to sub- 

 elliptical or fusiform, bluntly rounded or slightly tapering towards the apex, sym- 

 metrical or often slightly bent. Average dimensious 0.055 X 0.025""°. Promycelia 

 several, not uncommonly proceeding from either extremity. Pedicels when youug 

 often more or less inflated below the spore. Mycelium perennial in leaves, branches 

 or trunks of Junijyerus wuv/miana very commonly inducing a " bird's nest" distortion. 



Bocstelia stage. — Spermogouia yellowish orange, preceding the aecidia by about 10 

 days. Jicidia hypophyllous or more commonly on petioles, young shoots and 

 especially on young fruit, densely clustered, brown, at first subulate, then fimbriate, 

 the peridia splitting to the base with its divisions slightly divergent. Peridial cells 

 rather slender, the ridges somewhat prominent, sublabyrinthiform, horizontal or 

 becominginwardly obliqiietowardsthe extremities. Average measurements (towards 

 the apex of the peridia) &.07 X 0.018"^"\ Aecidiospores smooth, spherical, or irregu- 

 larly oval to oblong, average diameter 25""". 



Mycelium annual in the leaves of Cydonia (quiuce) and in leaves, stems, and fruit 

 of Amelanchier canadensis (service-berry) in June. 



Delaware Station, Bulletin No. 10,* October, 1890 (pp. 32). 



Introduction, A. T. Keale, Pn, D. (pp. 3-7). — Attention is called 

 to some important points connected with the report on the use of fun- 

 gicides for diseases of the grape, as given in the bulletin. 



(1) A vineyard in Delaware, measuring 45,888 square feet, in 1890 

 yielded a crop which sold for $933.24. "Of this amount $710.75 

 was left after harvesting, shipping, and commission expenses had been 

 paid; this is equivalent to $674.30 per acre." Good management of 

 the vine3'ard, neatness in preparing fruit for sale, and business ability in 

 finding and holding a first-class market, can account for only a portion 

 of this profit ; the rest seems to have been due to the use of fungicides, 

 which prevented the black rot from ruining the fruit. 



(2) " The method of leaving a few unsprayed trees in the center of a 

 vineyard to represent what the vineyard would yield if the black rot 



Bulletin No. 9 has not yet been issued. 



