2 Setckell. — An Examination of the Species 
species agrees so well in its essential characteristics with D. 
alismatis , that he was encouraged to propose the new genus 
for their reception. He named this species D. Farlowii , but 
notes at the end that De Bary considered it identical with the 
Sclerotium occultum , Hoffm. (Ic. Anal. Fung., p. 67, Taf. 16, 
Fj g- 3 )- 
Farlow, also, has published notes on this species (Bot. Gaz., 
vol. viii, pp. 2 76 and 318; Trans. Ottawa Field Nat, Club, 
vol. ii, p. 127), and has described a new species from the 
White Mountains of New Hampshire, on Epilobium alpinum 
(Bot. Gaz., vol. viii, p. 277 ; Appalachia, vol. iii, p. 239). Fisch 
gave a detailed account of the structure and development 
of Protomyces sagittariae , Fuck, in 1884 (Ber. Deutsch. Bot. 
Gesell., Bd. II, p.405), and demonstrated that it is very nearly 
related to D. alismatis. 
Since then a number of old species have been referred to 
the genus, and several new ones described. Schroeter, in 1887 
(Pilzfl. Schles., pp. 286, 287), added three species from the old 
genus Protomyces. Winter, in 1885 (Journ. Myc., vol. i, p. 102), 
described a new species from the United States, and in 1886 
(Rev. Myc., vol. viii, p. 207) another new one from Australia. 
De Toni revised the genus in 1888 (Journ. Myc. vol. iv, p. 13), 
and brought in two additional species. The last addition is 
a species from Portugal ( D . lythropsidis , Lag.). 
These several species differ from one another, according to 
Schroeter ( 1 . c., p. 286) and De Toni ( 1 . c., p. 13), chiefly in the 
character of the host. The writer has been able to examine 
nine species in greater or less detail, and has designed to study 
the structural details, and where possible the development, in 
order to determine more accurately, if possible, the relations 
of these species both to each other and to the species of nearly 
related genera. He has also been able to study the two species 
described by Cornu, viz. D. alismatis and D. occulta , from living 
material. In the search for members of this genus four new 
species have been discovered, and Prof. Burrill has kindly sent 
a fifth. These new forms add many interesting facts to those 
afforded by the old ones. 
