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Cultural studies of four north american species in the ganoderma lucidum complex with comparison to ganoderma lucidum and ganoderma tsugae



Cultural studies of four north american species in the ganoderma lucidum complex with comparison to ganoderma lucidum and ganoderma tsugae



Mycological Research 92(2): 182-191



Cultural characteristics of four species in the Ganoderma lucidum complex from North America were studied: G. colossum, G. zonatum, G. oregonense and G. meredithiae. Isolates of G. colossum produced thick-walled, globose chlamydospores with spines projecting from surface reticulations. Isolates of G. zonatum, G. oregonense and G. meredithiae did not produce chlamydospores; however, all three species produced staghorn hyphae, thin- and thick-walled cuticular cells, and thin-walled hyphal vesicles that ruptured readily when prepared for bright-field microscopy. These characteristics were not observed in cultures of G. colossum. Isolates of G. zonatum produced previously undescribed structures which are termed hyphal rosettes. These structures were composed of several hyphal branches projecting from a common origin and are not found in other species. Optimum temperature ranges for isolates of species studied were: G. colossum 35-40.degree. C, G. zonatum and G. meredithiae 25-30.degree., and G. oregonense 20-25.degree. Isolates of G. oregonense did not grow above 30.degree., while isolates of G. zonatum and G. meredithiae grew at 35.degree. but not at 40.degree. Isolates of G. colossum grew slowly at 45.degree. and survived exposure to 50.degree. Cultural characteristics of the species studied were compared to isolates of G. lucidum and G. tsugae. All six can be distinguished by cultural morphology and temperature relationships, except G. tsugae and G. oregonense, which were different from the others but similar to each other. A cultural description of G. zonatum is presented.

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