云南油杉枝锈病一新病原———油杉被孢锈(新种)

PERIDERMIUM KETELEERIAE-EVELYNIANAE ZHOU ET CHEN, A NEW SPECIES OF RUST FUNGI ON KETELEERIA EVELYN IANA

本义报道了在云南油杉(Keteleeria evelyniana Mast.)上引起枝干锈病的被孢锈属一新种——油杉被孢锈Peridermium keteleeriae-evelynianae Zhou et Chen,并从所致病害症状、锈子器和锈孢子的形态特点、锈孢子表面纹饰的扫描电镜观察等方面,讨论了新种与另一种云南油杉枝干锈病病原——昆明被孢锈(Peridermium kunmingense Jen)的主要区别。

Two species of rust fungi were reported on Keteleeria evelyniana Mast, i.e. Chrysomyxa keteleeriae (Tai) Wang et Peterson on host needles and Pe-ridermium kunmingense Jen forming fusiform tumors on twigs and stems. Recently, a new pathogen causing twig rust on the same host was found at the Hot Spring region in Kunming. The aecia are buried under epidermis of oblate spheroidal tumors on the host twigs. The scanning electron microscopic observation shows that there are longitudinal ditchs on the warts of aeciospores obviously. A new species, Peridermium keteleeriae-evelynianae Zhou et Chen is therefore proposed. Latin diagnoses and the SME photos are given. The main differences between this species and P. kunmingense are discussed. The holotype is deposited in the Plant Pathology Herbarium of Southwest Forestry College, Kunming, Yunnan.