第一讲 真菌概述_幻灯.pptVIP

* 015. Scanning electron micrograph showing a typical basidium of Agaricus campestris with four sterigmata and three remaining mature basidiospores. * 001. Five kingdom system of classifying living things showing that both fungi and animals may have evolved from a common ancestor. Zygospores of Rhizopus sexualis. Sexual reproduction in the Zygomycetes is isogamous, i.e. reproduction usually involves two gametes of similar size (see the two suspensor cells either side of the black, rough-walled zygospores). Scanning electron micrograph of a zygospore of Rhizopus homothallicus showing two suspensor cells either side of a rough-walled zygospore Mature sporangium of Rhizopus microsporus showing a globose columella supporting a mass of sporangiospores. Asexual reproduction in the Zygomycetes is by the production of non-motile sporangiospores in a sporangium. Collapsed umbrella shaped columella of Rhizopus stolonifer following sporangiospore dispersal Scanning electron micrographs showing striate sporangiospores of Rhizopus stolonifer. 子囊孢子（ascospore）：由两个异形配子囊结合，发育成子囊，子囊中形成的孢子叫子囊孢子，一般为8个。子囊菌的有性孢子。 A linear, cylindrical, eight-spored ascus of Sordaria fimicola. Note ascosporogenesis (sexual reproduction in the Ascomycotina) involves the formation of ascospores, typically eight, by free cell formation within an ascus. Clavate shaped, eight-spored asci of the Loculoascomycete, Leptosphaerulina showing multicellular ascospores. 担孢子（basidiospore）：由双核菌丝上产生的担子上形成的外生孢子。一般为4个。担子菌的有性孢子。 014 014. Scanning electron micrograph of a small cross section of a gill from the common field mushroom Agaricus campestris showing typical basidia in various developmental stages. Note basidia typically produce four basidiospores supported on fine peg-like structures called sterigmata. 015 015. Scanning electron micrograph showing a typical basidium of Agaricus campestris with four sterigmata and three remaining mature basidiospores. Basidiospore Formed externally on a pedestal (basidium) S