CLINTON: NORTH AMERICAN USTILAGINEAE. 
371 
folhcs , Wise. ; E. Virginicus, Ill.; Phleum pratense, Calif., 
Ia., Ill., Ind., Ivans., Mass., Minn., Mo., Ohio, N. J., N. Y., Utah, 
Wise.; Can.; ? Poa annua , Mass. ; P. debilis , Wise.; P. pratensis , 
la., Ill., Ohio ; Sitanion longifolium , Calif.; Unknoion grass , Mass., 
N. J., N. Y., Tex., Wash, (type U. Washingtoniana) . 
Botanists differ considerably as to what should be included under 
this species. The following, which are sometimes given as syn¬ 
onyms, appear to be distinct species: Ustilago macrospora Desm. 
(including Tilletia acideata Ule and Tilletia serpens Karst.) and 
Ustilago Calamagrostidis (Fckl.) Clint. Ustilago striaeformis, 
with its related species, is usually placed under the genus Tilletia, 
apparently under the impression that Fischer de Waldheim found it 
to belong there through the germination of the spores. There seems 
to be no evidence, however, that he or any European botanist has 
figured the germination of this species. Pammel, of Iowa, gives a 
somewhat questionable figure tending to show the germination to be 
that of a Tilletia. The writer has tried many times to germinate 
the spores found on Phleum and Agrostis and in a few instances 
has germinated a few spores from the latter host. In these cases 
the spores sent out elongated germ tubes but did not produce 
sporidia. The general aspect of these species is that of Ustilago 
and as there seems to be no real evidence that they are Tilletias 
they have been classified here under the former genus. This smut 
sometimes occurs with Urocystis Agropyri or Ustilago hypodytes 
on the same host plant. Literature: 27, 73, 133. 
Ustilago Calamagrostidis (Fckl.) Clint. 
Tilletia Calamagrostis Fckl., Symb. Myc., 40. 1869. 
Ustilago Calamagrostidis Clint., Journ. Myc., 8: 138. 1902. 
Exsiccati: Tilletia striaeformis (Westd.) Wint., on Calamagrostis Cana¬ 
densis acuminatus , Griff., West. Amer. Fungi, 228. 
• 
Sori in leaves, more rarely also in axis of inflorescence and even 
in spikelets, generally showing as linear striae, distinct or often 
more or less confluent, at first covered by epidermis, upon rupture 
disclosing dusty brown black lines of spores ; spores medium to dark 
reddish brown, rather irregular, oblong to spherical, usually angular, 
prominently verrucose, 13 -20 /x in length. 
Hosts: Calamagrostis Canadensis, Vt. ; C. Canadensis var. 
acuminatus , Wyo. ; C. Pickeringii , N. Y. 
