354 MELAMPSORA 
short chains, without paraphyses, roundish to ellipsoid, densely 
verrucose, 21—28 x 19—24 y.] 
Uredospores. Sori hypophyllous and on the stems, scattered 
roundish or oblong, soon naked, but surrounded by the epider- 
mis, golden-brown, mixed with numerous capitate paraphyses ; 
spores roundish, orange, 15—17 x 11—14 y; epispore colourless, 
echinulate, without perceptible germ-pores; paraphyses hyaline, 
with strongly thickened heads, 16—23 w diam. 
Leleutospores. Sori amphigenous, subepidermal, minute, 
roundish or oblong, reddish-brown, then black, more or less 
pulvinate, on the stems often confluent; spores prismatic, 50— 
60 x 10—14 wz; epispore brown, thin, at length thickened above 
(up to 5 w) and darker. 
On Euphorbia exgua, E. Helioscopia, FE. Peplus. May— 
October. Very common. (Fig. 264.) 
Miiller, on the ground of cultures, considers the form on £. Helioscopia 
as a separate species from those on Z. Peplus and E. exigua, the latter 
two also being biologically distinct from each other (Centralbl. f. Bakter. 
2, xix. 441). In his experiments he observed a czeoma-stage on £. exigua 
which the others did not have. This stage seems to be very rarely met 
with, and has probably not occurred in this country: the description of 
the spermogones and czeomata is from Fischer. In the same species, as it 
occurs on £. Cyparissias, Jacky states that he obtained the uredospores 
by infection with the basidiospores without the intervention of the 
ceoma-stage, so that M. Huphorbiae may be in a transition state between 
a eu-form and a hemi-form. The ecidium on £. exigua recorded by 
Plowright (Zc. p. 270) belongs to Uromyces tuberculatus ; sce p. 102. 
DistRIBUTION: Europe, Siberia. 
13. Melampsora Hypericorum Wint. 
Uredo Hypericorum DC. Flor. fr. vi, 81. Cooke, Handb. p. 526; 
Micr. Fung. p. 215, pl. 8, f. 174, 175. 
Melampsora Hypericorum Winter, Pilze, p. 241, Plowr. Ured. p. 243. 
Sace, Syll. vii. 591. Fischer, Ured. Schweiz, p. 506, f. 317. 
McAlpine, Rusts of Australia, p. 191. 
«Ecidiospores. Czomata hypophyllous, scattered, roundish 
or oblong, flatly pulvinate, often very small, subepidermal, long 
covered, at length erumpent, orange, showing as indefinite pale- 
yellow or orange spots on the upper face; spores in short 
