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1899 | BRIEFER ARTICLES 421 
be expected in a Puccinia, but among them were found a few spores of 
more than two cells. The multicellular spores were in some cases not 
unlike those of P. ¢riarticulata B. & C., but owing to their scarcity and 
the fact that the two-celled spores agree in size and shape with those 
Wag 
a, normal; 4, three-celled; c, 
Fic. 5.—Teleutospores of Puccinia Rubigo-vera. 
four-celled. 
of P. Montanensis Ell. it is best to regard it as that species. The posi- 
tion of the septa in some of the spores would be very hard to des- 
cribe. Some spores were quite regularly three and four-celled, while 
in others oblique, transverse, and perpendicular septa were present, all 
in one spore. The three-celled forms were of two kinds, regular ones, 
and those in which two cells were found at the apex with one at the 
base, but occasionally this was just reversed. The measurements varied 
from 33 X 25m to 5533p 
A specimen of Puccinta Rubigo-vera (DC.) Wint. on Agropyron 
tenerum, collected at Ames in 1896, showed a considerable number of 
spores having three and four cells. The normal two-celled ge 
were greatly in excess of the others, being found in the proportion 0 
about fifty to one. The three-celled forms were usually somewhat 
irregular, though occasionally one was found in which the septa eee 
the spore at the right angles to the lateral walls. The four-celle 
forms were fewer in number than the three-celled, only a half dozen 
being found in three mounts. The septa were so placed as to divide er 
Spore in different planes. ‘The measurements of all were confine 
Within the usual limits for this species, 13-20% 28-55 ee 
On November 24, 1898, the writer picked up a piece of Ane 
Oat straw (Avena sativa L.) on the road in front of the von * = . 
at the Iowa State College. The rust sori presented all the noms % 
the sori of P. graminis Pers., appearing on the sheath as black 
oval confluent patches. 
