506 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
Both the diagnosis of the genus and the discrimination of the species are 
attended with great difficulties. 
Black-rust of Cotton.* — Prof. G. F. Atkinson describes this disease, 
which is very destructive to the cotton-crop in Alabama. The diseased 
spots show the presence of a considerable number of fungi, but the para- 
site to which it appears to be chiefly due is Cercospora gossypina. 
New Genus of Tuberculariese. f — L’Abbe I. Bressadola diagnoses 
the new genus Kriegeria as follows : — Sporodochia subinnata, mox 
superficialia, tremellinea laste colorata ; conidia clavato-cylindracea, e 
continuo pluriseptata, ex sporophoris simplicibus, stipitem constituenti- 
bus, oriundis, apice, et ad septa conidiola simplicia vel subfasciculata 
gerentibus ; conidiola obloDga vel clavata, fertilia, scilicet conidiola ipsis 
conformia germinantia. Hyphse myceliales e conidiis septatis oriundae. 
The single species, K. Eriophori , was found on the leaves of Eriophorum 
angustifolium. 
TJrocystis Violae and Ustilago antherarum.J — M. E. Boze has 
found TJrocystis Violse parasitic on Viola odorata. It is very easily 
recognized by the swellings it forms on the leaves and petiole of its 
host. The author also makes some observations on Ustilago antlierarum 
parasitic on Lychnis dioica. 
Gymnosporangium.§— Dr. C. v. Tubeuf gives a resume of the 
present state of our knowledge of the native German species of Gymno- 
sporangium , both in their teleutospore- and in their secidio-form ; and 
especially defines the distinctive characters of G. Sabinse , G. clavarise- 
forme, and G. tremelloides ( = G. conicum and G.juniperinum ). The latter 
is far the most destructive parasite to its host the juniper. The aecidio- 
forms of all these three species occur on a number of different trees and 
shrubs, all belonging to the Rosace®. 
The same author |] points out that the Uredine® cannot be deter- 
mined specifically by their Roestelia- or ®cidio-form alone, as these 
frequently vary according to the host. Thus Gymnosporangium tremel- 
loides produces on Cratsegus aecidia with long horn-shaped, on Sorbus 
latifulia aecidia with very short peridia. The same species of tree may 
act as host for more than one teleutospore-species, as species of Sorbus 
for both G. tremelloides and clavariseforme. 
New Anthracnose of Pepper.1T — Under the name Colletotrichum 
nigrum , Prof. B. D. Halsted describes a newly observed destructive 
parasite of the fruit of the pepper ( Capsicum annuum ), characterized by 
a large number of long straight black bristles which are found among 
the basids. 
Sigmoideomyces, a new Genus of Hyphomycetes.** — Among a 
number of new North American fungi, belonging to the Hyphomycetes, 
Mr. R. Thaxter describes a new genus, Sigmoideomyces , with the 
* Bot. Gazette, xvi. (1891) pp. 61-5. f Bev. Mycol., xiii. (1891) pp. 14-5. 
X Bull. Soc. Bot. France, xxxvii. (1890) pp. 233-4 and xxxviii. (1891) pp. 69-71. 
§ Central hi. f. Bakteriol. u. Parasitenk , ix. (1891) pp. 89-98, 167-71 (3 fig&.). 
SB. Bot. Yer. Miinchen, Feb. 11, 1891. See Bot. Centralbl., xlvi. (1891) p. 19. 
Bull. Torrey Bot. Club, xviii. (1891) pp. 14-5 (5 figs.). 
** Bot. Gazette, xvi. (1891) pp. 14-26 (1 pi.). 
