Part 4, 1920] 
AECIDIACEAE 
269 
. The species of Dicaeoma, now made to include also the species previously placed under 
Eriosporangium, are grouped under the various families of the telial hosts, and the families 
follow the succession now generally accepted by students of phanerogamic plants. 
Uredinia and telia inhabiting monocotyledonous hosts. 
Host belonging to family Poaceae. 
Telia early or soon naked. 
Urediniospore-pores basal, placed around the hilum. 
Urediniospore-pores equatorial. 
Uredinial paraphyses present. 
Urediniospore-wall moderately thin (2 » or less). 
Urediniospore-wall yellow or colorless. 
Paraphyses colorless, usually erect. 
Paraphyses usually golden-brown, 
curved. 
Urediniospore-wall brown. 
Paraphyses erect. 
Paraphyses thin-walled, 2-4 » thick above. 
Paraphyses thick-walled, 7-10 yu thick above. 
Paraphyses encircling the sori. 
Paraphyses intermixed. 
Urediniospore-pores 4 or 5; telio- 
pores short, 29-39 p. 
Urediniospore-pores 4; teliospores 
longer, 39-50 p. 
Paraphyses incurved. 
Urediniospore-wall moderately thick (more than 
in- 
B). 
Teliospore-wall much thicker above, 5-10 4. 
Teliospore-wall slightly thicker above, 2-3 u. 
Uredinial paraphyses absent. 
Uredinicspore-wall moderately thin (2 4 or less). 
Urediniospore-wall pale-yellow or colorless. 
Urediniospore-wall thicker above (5-10 4). 
Urediniospores medium-sized (up to 35 yu). 
Urediniospores very large (up to 48 yu). 
Urediniospore-wall of uniform thickness. : 
Urediniospore-pores obscure, probably 2. 
Urediniospore-pores usually distinct, 4. 
Urediniospore-wall dark-yellow or brown. 
Urediniospore-wall verrucose. 
Urediniospore-pores 2 or 3. 
Urediniospore-pores usually 4, rarely 5. 
Urediniospore-wall echinulate. 
Urediniospore-pores 2 or 3, rarely 4. 
Teliospore-wall thick (2.5—3 y). 
Teliospore-wall thin (1.5-2 yu). 
Urediniospore-pores 3 or 4, rarely 2. 
Uredinia minute (0.1-0.8 mm. long). 
Urediniospores rather large, 26-29 
x 27-37 gw. 
Urediniospores medium-sized, 15- 
27 x 20-32 p. 
Uredinia larger (0.4-3 mm. long). 
Urediniospore-pores covered with 
cotispicuously swollen cuticle. 
Urediniospore-pores not covered 
with conspicuously swollen 
cuticle. 
Urediniospores coarsely echin- 
ulate. 
Urediniospores finely or some- 
what noticeably echin- 
ulate. 
Urediniospores large (29-45 
mw long). 
Teliosporesslightly thick- 
ened at apex (up to 
44). ; 
‘Teliospores considerably 
thickened at apex (up 
to 9p). 
Urediniospores medium- 
sized (19-35 yu long). 
Teliospores slightly 
thickened at apex 
(4-7 p). : 
Teliospore-pedicel 
short (one-half 
length of spore). 
43. D. Sporoboli. 
20. 
96. 
24, 
22. 
21. 
46. 
yo 8b 
tubulosum. 
ignavum. 
. tubulosum. 
. Kaernbachii. 
. unicum, 
venustulum. 
ignavum. 
virgatum. 
melanocephalum. 
. verbenicola. 
. Fraxini. 
. deformatum, 
. poculiforme. 
Cynodontis. 
airum, 
leve. 
. Hubert. 
. Arundinellae. 
. tubulosum. 
. impositum. 
. inclitum, 
. Chaetochloae. 
. simulans. 
. substriatum. 
