366 



PUCCINIASTRUM 



Teleutospores, I [ypophyllous, in little subepidermal groups, 

 roundish or Battened al the sides, divided longitudinally into 

 aboul 2 4 cells, 17 — 24x21 — 28/u.; epispore of uniform 

 thickness (about 2 /x), clear-yellowish, smooth. 



On Gircaea intermedia, G. lutetiand. Rather common in the 

 uredo-stage. June — September. (Fig. 273.) 



It is probable that this, like Pucciniastrum pustulatum, has an aicidium- 



stage mi a i iter, lmt untiling has yet been discovered to confirm the 



suspicion. Puccinia Circaeae bas sometimes been confounded with this 

 species, though they have nothing in common but the host-plant. They 

 may both be found on the same leaf. 



Distribution : Central Europe. 



3. Pucciniastrum pustulatum Dietel. 



Vredo pustulata Pers. Syn. p. 219. Cooke, Handb. p. 526; Micr. 



Fung. p. 21"). 

 M 'ebtm psora pustulata Schrot. Pilz. Schles. p. .'504. Plowr. LTred. p. 244. 

 Pucciniastrum Epilobii Otth in Mittheil. Nat. Gesell. Bern, 1861, p. 72. 



Sacc. Syll. vii. 762. Fischer, Ured. Schweiz, p. 4.")!). 

 P. Abieti-Chamaenerii Kleb. Wirtswechs. Rostpilze, p. 393. 

 P. pustulatum Dietel, in Engler u. Prantl, Nat. Pflanzen. i. 1**, 47. 



Arthur, X. Atner. Fl. vii. 107. 



[Sperm ogu nes. Hypophyllous, abundant, subcuticular. 



^Ecidiospores. iEcidia hypophyllous, whitish, mostly in two 

 rows corresponding to the two white lines, 

 J mm. wide, 1 mm. high, cylindrical, with 

 an evident peridium, opening by longitu- 

 dinal slits ; spores mostly oval, 13 — 22 x 

 10 — 14 p, (15 — 17/u, Dietel); epispore finely 

 verrucose, but with a thinner and smooth 

 area which often forms a longitudinal strip.] 

 Uredospores. Sori hypophyllous, caus- 

 ing reddish or yellowish spots on the upper 

 surface, roundish, \ mm. wide, scattered or 

 in little groups, often confluent, orange, 

 surrounded by the peridium and the remains 

 of the epidermis: spores mostly oval, orange- 

 yellow, distantly echinulate, 15 — 22 x 11 — 

 14 /a: paraphyses wanting. 



Fig. 274 



latum. 



V. pvstu- 

 .lEcidia on 

 leaf of A. pectinata, 



slightly enlarged; a, 

 a peridium, x 10. 

 From a foreign 

 specimen. 



