95 
20. Scolecotrichum maculicola, E. & K. Phragmites communis. 
21. Septoria argopiiylla, E. & K. Psoralen argopiiylla. 
22. Septoria specularize, 13. & C. (a) Specularia perfollata {!>) Spcc- 
ularia leptocarpa. 
23. Spelerotheca fhytoptopiiila, Kell. & Sw. Ccltis occidentalis. 
24. Uredo quercus, Bordean. Quercus macrocarpa. 
25. Ustilago ze.e mays, (DC.) Winter. (Eucklcena luxurians.) 
THE ASH-LEAF RUST (iECIDIUM FRAXINI). 
This fungus was very abundant in the vicinity of Washington during 
the summer of 1887, occurring on large and small trees both in and out 
of the city. Last year (1888) it was comparatively rare, occurring only 
on small trees in the country, especially those growing along streams 
or in shady woods. At this time an attempt was made to germinate 
the spores. They were sown in water, moist air, and several culture 
fluids, but only in a few cases did they develop germ tubes. As a 
rule mcdiospores germinate readily when fresh, so that it is difficult to 
account for the non-success attending our trials. It would be interest¬ 
ing to know whether the spores of this fungus will germinate more 
readily in seasons when it is abundant. 
TREATMENT OF GRAPE MILDEW MADE OBLIGATORY. 
According to Chronique Agricole et Viticole , published at Lausanne, 
Switzerland, a decree was issued on May 4, 1889, making the treat¬ 
ment of vines for mildew obligatory. The decree provides that the 
Department of Agriculture shall give the necessary instructions, and 
unless these are complied with within the prescribed time the vines 
will be taken iu hand by the authorities and treated at the expense of 
the owners. The owner for each offense will also be subject to a fine 
of not less than 10 nor more than 90 francs, this being equivalent to 
about $2 and $18, respectively. 
DIORCIIIDIUM TRACYI, DE TONI (PUCCINIA VERTI-SEPTA, TRACY & 
GALLOWAY). 
This interesting fungus was discovered on a specimen of Salvia 
ballatcvflora from New Mexico in the herbarium of the Department 
of Agriculture at Washington, and was described in the Journal 
of Mycology, Yol. IV, p. 21. As there are, so far as we know, only two 
meager specimens of this species iu existence, we have thought best to 
illustrate it (Plate X, Figs. 3 and 4), so as to preserve its identity in 
case anything should happen to the specimens. The genus was estab¬ 
lished by Kalchbrenner in 1883,* and as it now stands contains five 
species as follows: 
Diorchidium woodii, K. & C., on Melletia ca/m from South Africa. 
D. binnatum, (B. &. C.) De Toni, on unknown host from Nicaragua. 
D. tracyi, (T. & G.) De Toni, on Salvia ballataflora from New Mexico. 
D. pallideum, Winter, on unknown host from Brazil. 
D. leve, Sacc. & Bizz., on Manisurus granularis from Brazil. 
25002—No. 2 
4 
* (Grew, XI., p. 2G.) 
