192 Trans. Acad. Sct. of St. Louis. 
tened on two sides. Sclerotia, as DeBary ! has pointed out, 
show marked differences in their anatomical characters. 
The sclerotia of several species of, Sclerotinia have a thin, 
black, smooth or rough rind ; the medulla is white or whitish. 
The rind of the sclerotia to which Agaricus tuberosus belongs 
is yellow-brown and quite smooth. The sclerotium of Clavi- 
ceps is well represented by common ergot. It consists of a 
white medulla surrounded by a violet brown rind. 
It may be of interest to briefly review some of the differ- 
ent forms of the species of Sclerotinia. One of the best 
known is the Sclerotinia libertiana, Fkl., commonly called 
Peziza sclerotioides, Lib.? This fungus has been the subject 
of several interesting papers. Kiihn* was familiar with this 
fungus, although he gave only a short description. DeBary,‘ 
gained a more accurate knowledge of the fungus. He made 
a most interesting communication on the conditions necessary 
for the penetration of the germ tubes into the tissues in order 
that it could lead a parasitic life. 
Brefeld’s work confirms the results of DeBary’s investiga- 
tion. His studies of Sclerotinia tuberosa® are noteworthy 48 
showing that the fungus can be grown in nutrient media. Just 
as this paper was about to be sent away there has come to me 
Humphrey’s* paper on a Sclerotium Disease of Cucumbers, in 
which the author gives a most interesting account of the life 
history of WSclerotium libertiana. The author made suc- 
1 Comparative Morphology of Fungi, Mycetozoa, and Bacteria. English 
translation, Garnsey and Balfour. Oxford. 1887. 3 : 
2? Symbolae mycologicae, Beitrige zur Kentniss der Rheinischen Pilze, 
Peziza sclerotium, Libert. Exs. No. 326. Brefeld, ecemennae Untersuchunges 
iiber Schimmelpilze, Untersuchungen Gesammtgebiete der 
Mykologie, Heft IV. Leipzig. 1881. P- 112. P. —— Bagh ti Bot. 
Zeit. 1861. No. 35. Th Sylloge Fungorum, 
Vol. VIII, p. 196, and by Relim in Rabenhorat’s ci sptieuiiat iets, Vol. 
ia Abth. III, pp. 800-817. 
3 Krankheiten der Culturgewiichse, p. 
‘ mated ee mien der Lith ¥ 35, 60,201. Botanische Zei- 
tung, 1886, N 
5 Fuckel, nen * - ‘331. Sylloge Fungorum, Vol. VIII, p. 195. Brefeld, 
I ves p. 112 (Peziza tubderosa). 
A Sclerotium Disease —Sclerotinia libertiana, Fkl. Tenth ee 
ac ‘hase of the Board of Control of the Mass. State Agricaltaral Experimen 
 - Station, 1892, p. 212. 
