Abstract
In 1922 Sydow (4) described Rhabdocline Pseudotsugae Syd. and Rhabdogloeum Pseudotsugae Syd. on Douglas-fir (Pseudotsuga taxifolia (Poir.) Britt.) from Montana and suggested that the latter is the imperfect stage of the former. A review of the literature reveals only a few references to Rhabdogloeum since that time. Dearness (2) reported its presence in a collection from Colorado and at the same time described Rhabdogloeum abietinum Dearness on Abies Fraseri (Pursh) Poir. from North Carolina. Wilson and Wilson (6) report the occurrence of a conidial stage of Rhabdocline that develops in late summer on the upper surface of Douglas-fir needles in America but state that it has not been found in Scotland. Van Vloten (5) considers their imperfect fungus to be Rhabdogloeum Pseuidotsugae but does not believe it is linked with Rhabdocline. In May 1939, a disease of 1-year-old (1938 origin) Douglas-fir needles, which appeared to be the needle blight caused by Rhabdocline Pseudotsugae, was observed in the Graham Mountains, near Safford, Arizona. Examination of the diseased needles revealed the presence of an imperfect fungus that, in some respects, resembled Rhabdogloeum Pseudotsugae (3). Needles collected from the same trees about one month later (June 1939) bore fruits of Rhabdocline Pseudotsugae, as well as the imperfect fungus. The disease was observed again in the same locality in May 1940.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
