The Peridermium Species on Pine Stems

Aeciospores of Cronartium flaccidum, C. ribicola and Endocronartium pini show no differences in morphology

“…The average dimensions of aeciospores reveal some variation between the samples (Table 2). According to PETERSON (1967), the average dimensions of the spores of P. pini (C flaccidum sensu lato) are 22-28/im (length) and 17-21 ^^m (width); the ratio of length to width is 1.2-1.4. These dimensions are consistently smaller than in this study.…”

“…The morphology of uredinia and telia of Puccinia grass rusts (SWERTZ 1994) and Melampsora leaf rusts (HELEER 1992) are commonly used in species identification and taxonomy. The surface warts, shape and size of the aeciospores of some Cronartium species have also been used as taxonomic criteria (PETERSON 1967;HIRATSUKA 1995). According to HIRATSUKA (1971), some of the stem rusts in Canada (£.…”

White pine blister rust in Korea, Japan and other Asian regions: comparisons and implications for North America

“…The taxonomic relationships among blister rust pathogens ( Cronartium and Peridermium ) of Pinus wallichiana are not yet well understood and are quite confusing in early reports. P eterson (1967) listed Peridermium indicum Colley and Taylor (C olley and T aylor 1927) as a rust on Pinus wallichiana (as P. griffithii ) and Ribes species of Himalaya. K han (1960) considered Cronartium ribicola and Peridermium indicum as synonymous species.…”

“…K han (1960) considered Cronartium ribicola and Peridermium indicum as synonymous species. P eterson (1967), however, considered Peridermium indicum morphologically distinct from Peridermium strobi and Peridermium kurilense ; but B agchee (1950) attributed the differences to climatic factors. Further uncertainty developed because Peridermium indicum was commonly regarded as synonymous with Peridermium strobi (P eterson 1967) which was often considered to be synonymous with Cronartium ribicola (C olley and T aylor 1927).…”

“…P eterson (1967), however, considered Peridermium indicum morphologically distinct from Peridermium strobi and Peridermium kurilense ; but B agchee (1950) attributed the differences to climatic factors. Further uncertainty developed because Peridermium indicum was commonly regarded as synonymous with Peridermium strobi (P eterson 1967) which was often considered to be synonymous with Cronartium ribicola (C olley and T aylor 1927). According to H iratsuka (1995a), Peridermium indicum should be considered as aecial state of Cronartium ribicola sensu lato (i.e., ‘in a wide sense’), and Peridermium strobi should be considered as an aecial state of Cronartium ribicola sensu stricto (‘in a narrow sense’).…”