184 MORPHOLOGY AND TAXONOMY, FUNGI, ETC. [Box. Absts., Vol. VIII, 



1273. Arthur, J. C. Nineteen years of culture work. Mycologia 13: 12-23. 1921.— A 

 discussion of the writer's conception as to what criteria must be used in delimiting rust species, 

 and an exposition of various changes in this conception as brought about by the gradually 

 increasing knowledge of the rusts. Cultural work (infection experiments) was primarily 

 undertaken to aid in a proper taxonomic treatment of species and the results of 19 years of 

 such effort are shown to have aided (1) in completing the life cycles for many species, (2) in 

 recognizing races within a species, and (3) in assuring a liberal point of view concerning the 

 fixity of such features as open or covered telia, 1- or 2-celled teliospores ( Uromyces and Puc- 

 cinia), variation in nvunber of the pores of the urediniospore, and in the position of these 

 pores. By means of cultural work much progress was made in delimiting a number of dis- 

 tinct species among the grass rusts possessing sub-epidermal telia and in reducing to syn- 

 onymy a large number of names. American Carex rusts, all of which had borne the names 

 Puccinia caricis or P. caricina, were separated into a number of distinct species. The idea, 

 held when the cultural work began, that hosts of any one species of rust would be found to be 

 closely related was upset when it was shown that the aecial hosts of Puccinia subnitens be- 

 longed to a number of different families. The conception of species was further modified 

 when it was found that collections of a single rust on different hosts show marked morpho- 

 logical differences. Cultures also showed that teliospores among the grass rusts are not neces- 

 sarily resting spores. "The culture work began with the too prevalent idea that all rusts 

 could be expected to conform in general to the well known Puccinia graminis. It closed 

 with the conviction that the rusts are far too diversified in their morphology, their numerous 

 characters, their physiological adaptations, and their range of hosts, to be represented by Puc- 

 cinia graminis in more than one out of numerous aspects." — H. R. Rosen. 



1274. Arthur, J. C. New species of Uredineae XII. Bull. TorreyBot. Club 47: 465-480. 

 IQ20.—Melampsora americana, Puccinia off uscata, P. senilis, P. gulosaB.. S. Jackson, Uredo 

 contraria, U. nitidula, Aecidium Ixorae, Ae. indecisum, Ae. Mitellae Ellis & Ev., Ae. sub- 

 simulans Arthur & Mains, Ae. Betheli, Ae. arctoum, Ae.renatum, Ae.arcularium, Ae. Liabi, 

 Ae. Batesii, Ae. Mesadeniae, and Ae. praecipuum are described as new species. The fol- 

 lowing new names and new combinations are also given: Pucciniasirum americanum (Farl.) 

 comb, nov., Puccinia proximella (Arth.) comb, nov., P. hiascens nom. nov., P. Heterisiae 

 H. S. Jackson nom. nov., Uromyces imperfectus nom. nov., and Uredo laeticolor nom. nov. — 

 P. A. Munz. 



1275. Bal, S. N. Commentationes Mycologicae. 8. Pseudoperonospora cubensis (B. & 

 C.) Roxten, on Trichosanthes dioica Roxb. Jour. Dept. Sci. Calcutta Univ. 3: 1-3. Jt fig. 

 1920.— The first record of the fungus from Bengal. A short description is g\\QVL.—W infield 

 Dudgeon. 



1276. Bal, S. N. Commentationes Mycologicae. 9. Cercospora personata (B. & C.) 

 Ellis, on Arachis hypogaea Linn. Jour. Dept. Sci. Calcutta Univ. 3:4-6. 4 fig- 1920.— A 

 record of the occurrence of the fungus in Bengal. — Winfield Dudgeon. 



1277. Bal, S. N., and K. G. Banerjee. Commentationes Mycologicae. 10. Rhinocla- 

 dium corticolum Mass., on the bark of Mangifera indica Linn. Jour. Dept. Sci. Calcutta 

 Univ. 3: 7-8. 5 fig. 1920.— A record of the occurrence of the fungus in BengaX.— Winfield 

 Dudgeon. 



1278. B ARLOT, J. Sur de nouvelles reactions colorees utilisables pour la diagnose d'especes 

 mycologiques. [On new color reactions useful in distinguishing species of fungi.] Compt. 

 Rend. Acad. Sci. Paris 171 : 1014-1016. 1920.— An aqueous solution of potash in 20-40 per cent 

 concentration is recommended. It can be used to distinguish the poisonous Mycena pura 

 from the edible Laccaria laccata, the former giving a yellow and the latter a dark brown 

 color. Gomphidius viscidus gives a violet brown, G. glutinosus a feeble yellowish brown, 

 and Amanita junquilla an orange yellow color; and Lactarius turpis yields a variety of color 

 reactions with various acids and alkalies. — C. H. Farr. 



