102 Report oF THE BOTANIST OF THB 
described were not to be regarded as distinct, and all were thrown 
together under the name Rhizoctonia violacea. In 1858 Kiihn* 
discussed more at length certain forms of economic importance, 
and made known some new hosts among agricultural plants. 
Fuckel? reported a perithecial form, Leptospheria (Byssotheciwm) 
circinans and also a pycnidial form of R. medicagimis D. C. The 
only claim for the relationship of these forms was based upon 
their association in nature. 
In a similar way other fungi have been subsequently suggested 
as perfect stages of Rhizoctonia, but evidence of genetic relation- 
ship is constantly lacking. 
Among forms more recently described may be mentioned an 
oak root-fungus discovered by Hartig. It was found closely 
associated with the ascomycetous form Rossellinia quercina, so 
that the reported rhizoctonial stage was described under the 
latter name. 
Scholtz! has described Rhizoctonia strobi, causing a disease of 
the Weymouth pine, and he was unable to establish any con- 
nection between the hyphze-of this Rhizoctonia and those of cer- 
tain fruiting forms on plants killed by this disease. 
Frank® has recently reported BR. violacea as destructive to grape 
vines. A perfect form is reported. which he names Thelephora 
rhizoctonmie. 
Rostrup has also described Rhizoctonia fusca, the cause of a 
disease of turnips in Sweden. Comes, Sorauer and Frank have 
also given full general accounts of the European rhizoctonial — 
diseases in their works on plant dseases. i 
The list of European host plants now covers a very wide 
range. The following are the most important plants affected: 
alfalfa, asparagus, beet, carrot, various clovers, crocus, fennel, . 
+ Kiihn, J—Krankheiten der Kulturgewiichse, Berlin, 1858. 
7 Fuckel.—Botan. Zeitung, 34, 1861 (p. 250). 
5’ Hartig, R.—Untersuch. aus d. forstbotan. Institut zu Mtinchen, 1888. 
* Scholtz.—Rhizoctonia strobi, ein neuer Parasit der Weymouthskiefer. 
Verhandl. d. zoolog. botan. Ges. Wien, 47: 541-557, 1897. 
5’ Wrank, B.—Hin neuer Rebenschidiger in Rheinhessen [Ref. Centrbl. f 
Bakt. Parasitenk. u. Infektionskr., 4, 781, Abth, II.] 
