The coarse-scale population structure of pathogenic Armillaria (Fr.) Staude species was determined on approximately 16 100 ha of relatively dry, mixed-conifer forest in the Blue Mountains of northeast Oregon. Sampling of recently dead or live, symptomatic conifers produced 112 isolates of Armillaria from six tree species. Armillaria species identifications done by using a polymerase chain reaction based diagnostic and diploid–diploid pairings produced identical results: 108 of the isolates were Armillaria ostoyae (Romagn.) Herink and four were North American Biological Species X (NABS X). Five genets of A. ostoyae and one of NABS X were identified through the use of somatic incompatibility pairings among the putatively diploid isolates. Armillaria ostoyae genet sizes were approximately 20, 95, 195, 260, and 965 ha; cumulative colonization of the study area was at least 9.5%. The maximum distance between isolates from the 965-ha A. ostoyae genet was approximately 3810 m, and use of three estimates of A. ostoyae spread rate in conifer forests resulted in age estimates for the genet ranging from 1900 to 8650 years. Results are discussed in relation to possible mechanisms that influenced the establishment, expansion, and expression of these genets; the genetic structure and stability of Armillaria; and the implications for disease management in this and similar forests.

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Camavi~elk baafieME gen. md sp.nov. (Ascomycetes: Wytismaaes) is a previously undeseribed needlecast fungus attackicing Phw strobm throughout the eastern U.S.A. from North Carolina to Maine. Pinus peuce was severely infected in m d e m Vernon%. Hysterofiecia average 3.2 cm long and are epipbylHous, subhypodemal, and dematiaesns, with clavate asei bearing short rod-sha* ascospores. Qcnidia are epiphyllous , subhypdemd, camalorous, blisterlike with one or more pores, md produce minute bacd.lar conidia. These c h r n c t e~s~c s separate this fungus from existing genera as presendy defined. R k m 4 : Le C a n a v i~e l k bmfieMii$en. et sp.nov. (Ascsmycktes : m y~s m d e s ) est rn chmpignsn du rouge des aiguilks, won-dtc~t jmqu'ici, qaai s9a$t%que au Pinu sfmbus dans I'ensemble de 19est des f h t s -~n i s , du nard de la Caroline aaa Maine. I 2 Pkus peace est se$rement infect& dam le word du Vermont. k s hysdro&&es mesurent environ 3.2 crn de long et sent kpiphyfles, subhypdedques et demtiCs, avec des asques clavifomes portant de c m~a ascospres en fame de batornet. Les pycnides sont Cpiphylles, s u b h y e e~q u e s , concoEores, en fome de pustule avec un ou p i i u~&~~s pores; eIles grduisent de petites csnidies m fome de bciles. Ces caract6ristiques distinpent e champignoa des genres existants, tels que prb=ntement dtfinis. Mots clds : Carnvirgella banfieuii, Pinm s~robus, Pinus peuce, rouge des d p a e s . [Traaduit par $a raction] An emly-season blighting of cument-year needles of Pisus strobw L. was first repod& by Dma (19688) as occurring koughout the nodeastem U. S .A. Since hen, several individuals studied the pmblem without elucidating a cause (see review by Dreisbach 1989). Bmfield (1963) attributed the problem to a nmdecast hngus, desc,bing the sequenw of development of the signs md sympmms, including the gross ces sf the sexual and as Ihby (=Me was o v a l m M or ignored far nmly th-ee decades9 md more recendy the blighthg was widely a&butd to ozone injury (e.g., Bennett 1986).

forms; an expanded set of artificial keys to all fungal species from both handbooks; and an updated, partially illustrated glossary. The main purpose of this handbook is to help facilitate the survey, collection, and handling of potential ROD-listed fungal species by USDA Forest Service and USDI Bureau of Land Management employees. Each species is represented by a condensed description, a set of distinguishing features, and information on substrate, habitat, and seasonality. We also present a list of known sites within the range of the northern spotted owl, a distribution map, and additional references to introduce the available literature on a particular species.

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