. The British rust fungi (Uredinales) their biology and classification. Rust fungi. CEONARTIUM 317 Teleutospores. Columns hypophyllous, cylindrical, curved, up to 2 mm. long, crowded especially along the veins of the leaf, sometimes covering the whole leaf, orange to brownish- yellow ; spores oblong, smooth, reaching 70 fi long x 21 /x broad. jEcidia on stems and branches of Pinus GeHibra, P. monti- cola, P- Strobus, March—June; uredo- and teleutospores on Kibes nigrum, R. rubrurn, etc.,'July—October. Uncommon except when imported; Surrey, King's Lynn, Exeter, West- bury, Wobum, Windsor Forest
. The British rust fungi (Uredinales) their biology and classification. Rust fungi. CEONARTIUM 317 Teleutospores. Columns hypophyllous, cylindrical, curved, up to 2 mm. long, crowded especially along the veins of the leaf, sometimes covering the whole leaf, orange to brownish- yellow ; spores oblong, smooth, reaching 70 fi long x 21 /x broad. jEcidia on stems and branches of Pinus GeHibra, P. monti- cola, P- Strobus, March—June; uredo- and teleutospores on Kibes nigrum, R. rubrurn, etc.,'July—October. Uncommon except when imported; Surrey, King's Lynn, Exeter, West- bury, Wobum, Windsor Forest, Perth, etc. (Fig. 240.). Fig. 240. a, sjioie oi Peridermium Strobi; 6, the teleutospore- columns on leaf of Eed Currant (reduced); c, uredospore; d, top of a column of teleutospores, x 600. This dangerous parasite, sometimes called the Weymouth Pine Rust, is confined in its aecidial stage to the five-leaved Pines ; it is reported on the continent also on F. excelsa and P. Lambertiana. The secidiospore is distinguished from that of Peridermium Pini and P. Cornui by the fact thai a great part of the surface is smooth. The attacked trees are stunted, the tops show a bushy growth that can easily be recognised; the part where the mycelium is growing is swollen. In the Currant, the attacked leaves become thicker in texture, and different in colour. It was first discovered, in this country, at King's Lynn by Dr Plow- right, who found the Cronartium on leaves of black, white, and red currant on July 3, 1892. On August 13 he exhibited in London a branch of P. Strobus affected by the mycelium of the alternate stage; the tree grew about fifteen yards away from the currant bushes. On March 19, 1893, he found the Peridermium in full,perfection at the same place. Though the secidium occurs in Europe chiefly on the We-^rnouth Pine (P. Strobus), yet that cannot be its original host, since neither Ctpnartium ribicola nor Peridermium Strobi was found in America (the home of P.
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