1890,] Botany. 179 
The uredospores of this species also illustrate an interesting feature, 
sometimes occurring among Uredinex,—the so-called “ germ pores” 
(Fig. 2, a), two or more hyaline points in the wall of the spore. The 
spore thus greatly resembles a pollen grain, the points being very 
likely analogous to the similar thickenings on the pollen grain, furnish- 
ing.a spot for the breaking through of the tube in germination. 
This peculiar feature is found also in the uredospores of Puccinia 
prenanthis (Pers.) Fuckel (Fig. 6, a, from specimens collected at 
Anselmo, Nebraska, July 8, ’89). The zcidium of this species is also 
peculiar, from its lack of genuine pseudoperidium. In the place of 
the usual pseudoperidium a — Aee hyphz mass occurs. 
This is probably the Æcidium hemisphericu 
In Puccina sporobok Arthur, (Fig. 3) I find one-, two- and three-celled 
teleutospores. This species is peculiar in that some of the sori bear 
only one celled teleutospores (Fig. 3, c, and @), while others bear 
only the normal two-celled teleutospores (Fig. 3., @ and 4), and still 
others produce a sometimes almost equal mixture of one- and two-celled 
teleutospores, with frequently also three-celled ones (Fig. 3, e represents 
a three-celled teleutospore measuring 26.6 by 14.4 #.) This pecu- 
liarity of one- and two-ce lled spore-sori I find only on specimens grow- 
ing on Sporobolus vagineflorus, collected at Lincoln, Nebraska, Octo- 
ber 13, 1889. Other specimens of the same species on Sporobolus 
asper and Sporobolus cryptandrus have only the two-celled ee 
Dr. Arthur in the original description from specimens on Sporobolus 
heterolepis mentions the same peculiarity. 
Puccinia tanacett D. C., var. actinelle Webber, on Actinella acaulis 
furnishes in the same sorus a remarkable variety of teleutospores, the 
contortions being almost as various as those of Puccinia flaccida, 
though not so frequent. Fig. 7, an, shows some of the various 
orms of the teleutospores ; (a) is a three-celled spore with two apical 
apices, the upper cell seems as if grown from the side of the middle 
cell; (4) is almost normal, with basal ceil large ; (¢) with large apical 
cell; (Z) one-celled ; (e) three-celled, 21 by 50 ».; (f) one-celled, 
with side point, 19 by 45 æ.; (g) one-celled, 26 by 28 x. ; (A) three- 
celled, 19 by 76 x. ; (#) curved, lower cell abortive; (7) one-celled, 
19 by 53 æ. ; (A) large, truncate, with side point, 38 by 45 #.; (Z) 
large truncate, 30 by P p.; (m) normal spore, 19 by 70 A ; (#) 
normal spore, 22 by 49 
The teleutospores of ie genus Uropyxis are exceedingly interesting 
and important as being one of the main proofs from spore resemb- 
lance that the Uredinez are degraded Ascomycetes, the teleutospore 
_ Am, Nat.—February.—5. 
