38 BOTANICAL GAZETTE. 
12*, P. AReNART® (Berk.) DeBary. 
Botrytis Arenarix Berk. Journ. Hort. Soe. Lond. I., 31. Pl. IV. 
df arena DeBary. Ann. Sci. Nat. 4Sér. Vol. XX., p. 110, Pl. XIII, f. 8, 9. 
Var. MACROSPORA Farlow. 
Conidiophores slender, repeatedly dichotomous, divisions — 
flexuous, tips short, subulate, erect. Conidia ovate-elliptic, 13- _ 
17» broad by 18-22» long, pale violet colored. Oospores 38-48? ; 
in diameter, very thick-walled, exospore deep yellowish brown, : 
marked with prominent papille or short ridges. _ a 
On leaves of Silene sp. ? Cobden, Illinois, Earle. : 
This striking species covers the under surface of the leaves of some caryor 
phyllaceous plant, probably a Silene. The species is intermediate between P. 
renariee ( Berk.) DeBary and P. Dianthi DeBary. The description given above, 
which was taken from Illinois specimens, shows that while the oospores are 
larger than those of P. Arenariw and in size approach more nearly those of P: 
Dianthi, yet the markings of the exospores are like those of P. Arenarie. In 
fact, the oospores are very strikingly marked, and in several respects recall the 
oospores of Cystopus candidus. The conidiophores and conidia resemble those of 
European specimens of P. Arenaric rather than those of P. Dianthi. I should 
_ hesitate to call the species new, while admitting that the American form does 
not conform to the type of either of the European species named, and it is dif- 
ficult to say whether, in the present case, we have a form of P. Arenarie with 
large oospores or a form of P. Dianthi with prominently marked exospores. _ 
13. P. Arthuri. 
Also on (Enothera biennis, Illinois, Earle. 
24. P. grisea, 
Also on Veronica arvensis with oospores, Anna, Ilinois, Earle. 
26. P. leptosperma, 
It was stated in the Enumeration that this species was first found in 
country at Lake Minnetonka, This is an error, as it was found by Prof. Bessey 
on Artemisia Ludoviciana in Towa, in September, 1882. 
29. P. sordida. | 
On Serophularia nodosa, Iowa, Arthur; Illinois, C. A. Hart. 
follows: 
_Conidiophores much and irregularly branched, dichotomous 
above, divisions divergent, tips acute, rigid, erect. Conidia vio- 
let-colored, ovate-elliptic, 20-23, long by 15-19 broad. 
