170 
CHARLES B. PLOWRIGHT. 
Puccinia Scliceleriana, n. sp. 
I. iEcidiospores (iEcidium Jacobseae, Grev., ‘ Flor. 
Edin./ p. 445), iEcidia in circular clusters, mostly upon the 
under surface of the radical leaves ; cups with reflexed torn 
white edges ; spermogonia upon the corresponding upper sur- 
face of the affected leaves ; spores rounded, yellow, finely 
echinulate ; I5fi to 20/j. in diameter. 
II. Uredospores upon yellow discoloured spots ; sori elon- 
gate or rubrotund, surrounded by the ruptured epidermis ; 
generally hypophyllous spores, subglobose or ovate, yellowish 
brown, rough; 25/ul to 30/ul long by 14/x to 20/u wide. 
III. Teleutospores — Sori erumpent, oblong or elongate, large, 
prominent, almost black ; hypophyllous naked, surrounded by 
the ruptured epidermis ; spores on long, firm pedicels, slightly 
constricted ; upper cell subglobose, ovate, or attenuated up- 
wards ; apex much thickened, rounded, or pointed ; lower cell 
cuneiform, often paler than the upper; rich brown, smooth ; 
60yu to 80/j. long by 15 /u. to 20/t wide. 
No. of 
Infecting 1 
Material. 
Plant Infected. 
Date of 
Expt. 
Infection. 
1st 
Result 
199. 
iEcidium 
J acobaeae 
Carex arenaria 
21 June 
15 
July. 
388. 
99 
99 
99 
99 
31 May 
12 
June. 
389. 
99 
99 
99 
99 
31 May 
20 
June. 
C 258. 
Puccinia 
caricis 
Urtica 
dioica 
16 Feb. 
11 
Mar. 
L 259. 
99 
99 
Senecio 
J acobaeae 
16 Feb. 
— 
( 200. 
99 
Schceleriana 
99 
99 
17 Feb. 
15 
Mar. 
t 261. 
)) 
99 
Urtica 
dioica 
17 Feb. 
— 
285. 
99 
99 
Senecio 
Jacobaeae 
6 Apr. 
30 
Apr. 
291. 
99 
99 
99 
99 
6 Apr. 
30 
Apr. 
292. 
99 
99 
99 
99 
6 Apr. 
30 
Apr. 
293. 
19 
99 
99 
99 
6 Apr. 
30 
Apr. 
294. 
99 
99 
99 
99 
6 Apr. 
30 
Apr. 
447. 
99 
99 
99 
99 
15 Sept. 
26 
Sept. 
Conclusions. — From the experimental cultures above 
it appears — 
1. That Ranunculus repens is the host plant upon which 
both Uromyces poae and Puccinia Magnusiana have 
their secidiospores. 
