. The British rust fungi (Uredinales), their biology and classification. Uredineae. ON 277 globose, aculeate, yellow-brown, 20—28x20—24 yu.; epispore 3—6 fjL thick, with three germ-pores. Teleutospores. Sori similar, often confluent and as much as 8 mm. long, conspicuous, pulvi- nate, black; spores elli])soid, rounded at both ends, slightly thickened (up to 5 jx) above, hardly constricted,smooth,brown, 32—46x20—30/x; pedicels hya- line or yellowish, curved, per- sistent, rather thin, very long (as much as 120/i); a few mesospores sometimes intermixed. [^cidia on Melanipyrum ; ur
. The British rust fungi (Uredinales), their biology and classification. Uredineae. ON 277 globose, aculeate, yellow-brown, 20—28x20—24 yu.; epispore 3—6 fjL thick, with three germ-pores. Teleutospores. Sori similar, often confluent and as much as 8 mm. long, conspicuous, pulvi- nate, black; spores elli])soid, rounded at both ends, slightly thickened (up to 5 jx) above, hardly constricted,smooth,brown, 32—46x20—30/x; pedicels hya- line or yellowish, curved, per- sistent, rather thin, very long (as much as 120/i); a few mesospores sometimes intermixed. [^cidia on Melanipyrum ; uredo- and teleutospores on Molinia coerulea, July—Oc- tober, Perthshire (Dr B. White). This secidium is not recorded for Britain, and ajDpears to be very rare everywhere. (Fig. 210.) Plowright, relying i;poii the experi- ments of Rostrup, connected the aicidiuui on Orchis latifolia with this Puccima, though he himself could not succeed in the infection. Others have similarly failed, iind there seems to be little doubt that Eostrup's conclusions were inaccurate. Juel has since then succeeded in showing that an recidium on Melampyrum p)xitense is part of the life-cycle oi a, Puccmia on Molinia, which he named P. nemoralis, but of which there is no proof that it is different fi'om P. Moliniae Tul. (Juel, ). Liro confirms this result and names his species P. jEcidii-Melampyri {). The aecidiospores are described by Sydow as "yellowish," but Juel describes them as colourless, like those of the allied species P. Phragrnitis and P. Trailii. Since the fecidium on Melampijrum has not been found in this country, the British species may turn out, on investigation, to be different from these. For there is a closely allied species or biological race, named by Cruchet (Centralbl. f. Bakter. 2. xiii. 96) P. Br%nellarum-Moliniae, which has teleutospores very like those of P. Moliniae Tul. but its secidium on. Fig. 210. P. Moliniae. Teleuto- epores, Eannoch (Dr Bucha
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