MELAMPSORA 355 
chains, ellipsoid to polygonal or subclavate, 18—28 x 10—18 w; 
epispore colourless, about 2 yu thick, — 
rather densely verruculose, with no aye 
perceptible germ-pores; no para- 
physes. 
Teleutospores. Sori hypophyllous, i 
subepidermal, small, roundish, red- ACRND a b 
dish-brown, then dark-brown ; spores 
prismatic, more or less rounded above, Fig. 265. M. Hypericorum. 
i a, teleutospores, under the 
pale-brown, 28—40 x 10—17 p; epi- epidermis; b, sxcidiospore, 
. without paraphyses. On 
spore thickened (up to 3 ») above. Pain agen 
On Hypericum Androsaemum, H. humifusum, H. perfora- 
tum, H. pulchrum. Not common. May—October. (Fig. 265.) 
What was described by Plowright as the uredo-stage of this fungus is 
stated by Fischer, Tranzschel, and others, to be the coma stage—the 
spores “being produced in short chains, with sterile intercalary cells, 
without paraphyses, but sometimes” (at least on Hypericum montanum) 
“surrounded by a layer of swollen colourless cells which might almost be 
considered as an undeveloped peridium.” Miiller considers the form on 
Hf. montanum as a biological race, since he could not infect other species 
of Hypericum with spores from it. 
But Klebahn has proved (Zeitschr. f. Pflanzenkr. 1905, xv. 106) that a 
species of Hypericum can bear both the caeoma-form without paraphyses 
and the uredo-form with paraphyses. McAlpine (Rusts, p. 192) récords 
that in Australia the uredo-sori have very abundant paraphyses, inter- 
mixed; he describes them as “hyaline, capitate, overtopping the spores, 
50—68 x 18—24 p.” His species was on leaves and stems of H. japonicum, 
and differs slightly from the British ones. His description of the uredo- 
sori is as follows: “Sori mostly hypophyllous, scattered or gregarious, at 
first bright-orange, becoming pale, pulverulent, up to 4mm. diam., 
erumpent and surrounded by the ruptured epidermis. Spores subglobose 
to ellipsoid, finely verrucose, orange-yellow, 14—21x 11—17 p, with two 
germ-pores on one face.” On the British specimens which I have seen, 
there are no paraphyses and the spores are decidedly in chains. 
DistRIBUTION: Europe, Siberia, India. 
14. Melampsora Lini Desm. 
Uredo miniata var. Lini Pers, Syn. Fung. p. 216. 
U. Taini Schum. Pl. Sail. it. 230. Arthur, N. Amer. Fl. vii. 101. 
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