云南牛肝菌属分组初探及两新种

本文对云南产牛肝菌属的分组和牛肝菌组下的亚组进行了初步组合;并报道了该属的一新组(鳞柄牛肝菌Sect.Squamulistipites Zang Sect.nov.)及两新种(鳞柄牛肝菌Boletus squamulistipes Zang sp.nov.和橙香牛肝菌Boletus citrifragrans Chiu et Zang sp.nov.)。

A TENTATIVE SUBDIVISION AND TWO NEW SPECIES OF BOLETUS FROM YUNNAN, CHINA

The Yunnan Boletes have been divided into the following sections: Sect. Truncati, Sect. Piperati, Sect. Boleti (including Subsections Calopodes, Luridi, Reticulati and Boleti published by R. Singer, A. H. Smith and H. D. Thiers et al.), Sect. Pscudoleccinum, Sect. Pseudoboleti and Sect. Squamulistipites Zang sect. nov. Key to the above sections is presented. Chinese and Latin diagnoses for the two new species are given. Boletus citrifragrans Chiu et Zang is similar to Boletus impolitus Fr. in many respects, but is distinguished by the following features: its context color unchanging when bruised and it tastes much of fragrance of Citrus, and larger basidiocarps (pileus 15—25cm broad, stipes 10—15 cm long, 3—5 cm thick). It is a famous edible boletes and popular in western Yunnan, N. W. Yunnan and South eastern Xizang (Tibet). The distribution area of this species seems to be limited to the Eastern Himalaya, often abundantly from 1900—4000 m alt., in Fagaceae woods, especially Castanopsis hystrix forest. Sometimes it is known from the South eastern Xizang (Tibet), in the Abies, Betula forests, 3700—4000 m alt. The fungus stipes are not reticulate but roughened to fibrillose scales in the Section Squamulistipes Zang sect. nov. and the type species Boletus squamulistipes Zang. These characteristics also can be found in Sect. Pseudoboleti and Sect. Pseudoleccinum, but they are easily distinguished. However, Boletus squamulistipes Zang has conspicuous scales on the stipe base still when mature and recognized by the deep brownish fruitbody. Probably, this species is so uncommon in the monsoon forest, especially under the Lithocarpus.