14 CONNECTICUT GEOL. AND NAT. HIST. suRVEY. [Bull. 
2. Sori in spikelets, ovoid. 
a. Spores usually lighter colored on one side, 
5-Op. 
* Spikelets entirely destroyed. ..U. Hordei. 
%* Spikelets smutted only at base. .U. levis. 
b. Spores uniformly colored, 8-IIp.....-.++- 
U. Crameri. 
B. Spores echinulate or verruculose. 
1. Sorus in each spikelet, distinct. 
a. Spores usually lighter colored on one side, 
5-9r- 
* Host Arrhenatherum avenaceum (Oat 
(GEASS). geacesgr sic: sioveraiainsae aise U. perennans. 
** Host Avena sativa (Oats)...U. Avene. 
“ek Host Hordeum vulgare (Barley)..... 
U. nuda. 
b. Spores uniformly colored, 10-14p.......+- 
U. Panici-glauci. 
2. Sorus involving the entire panicle............ 
U. Rabenhorstiana. 
3. Sori in the ovaries. 
a. Smooth.and inconspicuous, 1-2 mm. 
* Spores echinulate ...... U. spermophora. 
*k Spores verruculose ....... U. Eriocault, 
b. Hispid and conspicuous, 4-Io mm........ 
U. spherogena. 
4. Sori in leaves (rarely on stem). 
a. Forming nodular swellings, often at nodes 
U. Crus-galli. 
b. Forming linear striz in the blades........ 
U. strieformis. 
5. Sori breaking out on any part of host, often 
NATE: ssisriccs terrasse eratorsteuie sages U. Zee. 
II. Spores golden brown, verrucose; sori in seeds......... 
U. Oxalidis. 
III. Spores violet or purplish, reticulate, sori in flowers. 
1. Reticulations rather fine, 1-3n....U. anomala. 
2. Reticulations rather coarse, 2-4u.U. utriculosa. 
