. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. ON 261 Eriksson has divided this species into a number of forms which show- certain differences, chiefly biological : they are given in what follows, but it must be understood that they are distinguished almost entirely by their host-plants. They all show the same scattered, brownish-orange uredo- sori. Some, it is true, have recidia, others are not known to have them, but this is a difference which time may remove ; also Pole-Evans (1907) has shown that they present minute difference
. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. ON 261 Eriksson has divided this species into a number of forms which show- certain differences, chiefly biological : they are given in what follows, but it must be understood that they are distinguished almost entirely by their host-plants. They all show the same scattered, brownish-orange uredo- sori. Some, it is true, have recidia, others are not known to have them, but this is a difference which time may remove ; also Pole-Evans (1907) has shown that they present minute differences in the mode of germination of their uredospores. Many authors prefer to consider the biological races which follow as distinct species, but if that is done it is a mistake, which entails continual confusion, to retain the name P. dispersa for one of them. Distribution : Europe, Asia Minor, North America, and in Australia (probably only introduced). (1) PUCCINIA SECALINA 110V. nom. Puccinia dispersa (sens, strict.) Erikss. Ann. Sci. Nat. ser. 8, ix. 268, pi. xi, f. 1—6 (1899). Sydow, Monogr. i. 709. Fischer, Ured. Schweiz, p. 357, f. 261. Klebahn, "Wirtswechs. Rostp. p. 237. JEcidvwm Anchusae Erikss. et Pfenning, Getreideroste, p. 210. 2E. Asperifolii Pers. ; Cooke, Handb. p. 541 ; Micr. Fung. p. 197 JEcidiospores. iEcidia hypophyllous or often on the calyx and fruit, seated on rounded yel- lowish or reddish-yellow spots, cup-shaped, with an incised revo- lute margin; spores verruculose, orange, 20—26 ^Ecidia on Anckusa (Lycupsis) arvensis, very rare, Shere, Folkes- tone, Eltham, etc., August; uredo- and teleutospores on Secede Cereale, May—October. (Fig. 198.). Fig. 198. P. secalina. yEcidia on leaf of Lycopsis; teleuto- spores, ou neighbouring stems of Rye. The Brown Rust of Rye in the uredo- and teleuto-stages seems to be confined to that cereal. Eriksson and Klebahn have proved that it can be transferred from species of Anchvsa to the Rye and vice-versd
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