154 PUCCINIA 
28. Puccinia Taraxaci Plowr. 
Puceinia Phaseoli var. Taraxaci Rebent. Fl. Neomarch. p. 356. 
P. variabilis Grev. ; Cooke, Handb. p. 500; Micr. Fung. p. 207 p.p. 
P. Taraxact Plowr. Ured. p. 186. Sacc. Syll. ix. 305. Sydow, 
Monogr. i. 164. Fischer, Ured. Schweiz, p. 226, f. 178, 
Spermogones. In little yellow roundish clusters. 
Uredospores. Sori amphigenous, with or without spots, 
scattered, minute, sometimes confluent and larger, roundish or 
oblong, pulverulent, brown; spores glo- 
bose to ovate, echinulate, pale-brown, 
22—27 x 16—24 py, with two germ-pores. 
Teleutospores. Sori similar, but 
blackish, 4—3 mm. diam.; spores ellip- 
Fig, 106, Fi Doravact, soid to ovate, rounded at both ends, not 
Teleutospore anduredo- thickened above, not constricted, very 
oe delicately verruculose, brown, 25—388 x 
16—24; epispore thin; pedicels hyaline, short. 
On Turaxacum officinale, Rather common. Spermogones 
and primary uredospores in April; the teleutospores may be 
found till November. The distinctions which Plowright attempts 
to draw between the primary and secondary uredospores are 
not so marked as is the case in P. Centaureae, and break down 
in practice. (Fig. 106.) 
This species differs from P. variabil’s, with which it was formerly 
confused, chiefly in the absence of the ecidium. But, in addition to that, 
the uredospores of P. Taraxact are far more abundant and the sori more 
especially found on the upper leaf-surface ; the uredospores of P. variabilis 
are scanty and are usually intermixed in the teleuto-sori. P. Taraxaci is 
morphologically indistinguishable from P. Hieracii, but culture experi- 
ments have proved that it cannot be transferred from Taraxacum to the 
allied genera of the Composite. 
Plowright’s remark (/. ¢. p. 187) that I considered this species to have 
“a true eecidium” is a mistake, arising probably from a confusion between 
it and P. variabilis. 
DisTRIBUTION : Europe, North America, Japan, East Indies. 
