CLINTON: NORTH AMERICAN USTILAGINEAE. 
373 
logically closely allied to Ustilago macrospora The specimen in 
Cooke’s exsiccati has been examined but this seems nearer to Usti¬ 
lago striaeformis than to the species described here. It, however, 
may not agree with the type examined by Massee. The germina¬ 
tion of Ustilago macrospora has not been reported. Some of the 
specimens on Agropyrum spicatum approach very closely to Ustilago 
striaeformis , while the specimen reported on Elymus from Utah is 
evidently U. macrospora , though all the other specimens seen on 
this host-genus belong to U. striaeformis . 
Ustilago echinata Schrot. 
Ustilago echinata Schrot, Abh. Schles. Ges., Abth. Nat. Med., 1869-72:4. 
1869. 
Ustilago verrucosa Vest., Jahreskat. Wiener Krypt. Tausch., 3. 1897. 
Ustilago Baldingerae Vest., in sched. 
Ustilago Vestergreni Sacc. & Syd., Syll. Fung., 14: 413. 1899. 
Sori in leaf blades and sheaths, forming conspicuous elongated 
striae often running greater length of leaf, upon rupture forming a 
dusty or semi agglutinated brown black spore line; spores rather 
dark reddish brown, ovoid to spherical, provided with conspicuous 
irregular scale-like tubercles which are rarely semi-anastomosed, 
chiefly 14-17 /x, most elongated rarely 19 g, in length. 
Host: Phalaris arundinacea , Neb., Wash. 
This species is very closely related to Ustilago macrospora but 
apparently is provided with coarser projections on the cell wall and 
these do not anastomose as commonly as with that species. 
Ustilago Arthurii Hume. 
Ustilago Arthurii Hume, Proc. Ia. Acad. Sci., 9 : 233. 1902. 
Ustilago Scolochloae Griff., Bull. Torr. Bot. Club, 31 : 86. 1904. 
Sori in the enfolded leaves, forming linear striae chiefly on their 
inner surface, which soon become obliterated by the dusty reddish 
brown stratum of spores filling the interior; spores olive brown, 
rather regular, chiefly subspherical or spherical, abundantly covered 
with conspicuous tubercles or scales, rarely very slightly anastomos¬ 
ing, 12.5-16 g in length. 
Hosts: Glyceria grandis, Ia. (type); Scolochloa festucacea, Ore. 
(type U. Scolochloae). 
