PUCCINIASTRUM 367 
Leleutospores. Sori hypophyllous, clustered or widely con- 
fluent, {mm. wide, covered by the epidermis, reddish, then 
blackish-brown; spores shortly cylindrical or prismatic, 17— 
35 x 7—14 p, those in the middle of the sorus Melampsora-like, 
but at the periphery roundish or oval, and composed of 1—3 
cells, 1.e. divided by longitudinal walls; epispore clear-brown, 
thickened (up to 3) above, but with a thinner spot (? germ- 
pore). 
[Aicidia on Abies pectinata, June, July ;] uredo- and teleuto- 
spores on E’pilobium (Chamaenerion) angustifolium, E. palustre. 
August—October. Shere, Abinger, Surrey. (Fig. 274.) 
The ecidiospores are distinguished from those of Calyptospora Goep- 
pertiana by their smooth area and generally shorter length. The ecidium 
of Melampsorella Caryophyllacearum lives also on Abves pectinata, but 
produces thereon witches’-brooms, and finally swellings and canker of the 
branches, while P. pustulatum attacks the leaves only. Klebahn, Fischer, 
and Tubeuf have all demonstrated experimentally the genetic connection 
of the stages of this parasite, so far as concerns Z. angustzfolium ; but the 
form on £. palustre and its allies is probably, at least biologically, distinct. 
Klebahn’s name, quoted above, includes only the form on £. angustrfolium 
and the allied £. Dodonaet. He restricts the name P. Abzeti-Chamaenerwt 
to this, calling the form on £. palustre, E. montanum, etc. by the name 
P. Epilobii, and assigns to them also certain small morphological differ- 
ences. The collective species is conimon in North America, but the 
zecidium has not yet been recognised there. 
DISTRIBUTION: Europe, North America. 
4, Pucciniastrum Pyrolz Dietel. 
Eeidium Pyrolae Gmel. in Linn. Syst. Nat. ii. 1473. 
Uredo Pyrolae Grev. Flor. Edin. p. 440 p.p. Fischer, Ured. Schweiz, 
p. 539, f. 337. 
Trichobasis Pyrolae Berk.; Cooke, Handb. p. 529; Micr. Fung. 
p. 223 p.p. 
Melampsora Pyrolae Schrét. ; Plowr. Ured. p. 247. 
Pucciniustrum Pyrolae Dietel, in Engler u. Prantl, Nat. Pflanzen. 
i. 1**, 47, Arthur, N. Amer. FI. vii. 108. 
Thecopsora(?) Pyrotae Karst. ; Sace. Syll. vii. 766. 
Uredospores. Sori hypophyllous, minute, hemispherical, 
orange, on yellowish or purplish discoloured spots, surrounded 
by the epidermis and by a peridium which both open at the 
