A TAXONOMIC REVISION OF THE LICHEN GENUS XANTHOPARMELIA (VAIN.) HALE FROM CHINA
中国黄梅属地衣的初步订正

The lichen species of Xanthaparmelia from China have been confused in the literature. In the present paper a taxonomic revision of this genus is made on the basis of Chinese materials preserved in HMAS, S, UPS, H, and TUR. Six species, including a new status X. dentata (Zhao) Wei, a new variety X. tinctina var. xizangensis Wei, and a species X. incurva (Pers.) Hale new to China, are reportel. The results of morphological and chemical reexamination of Chinese materials, and the type specimens of some species of this group show that Parmelia conspersa Ach. from China in the literature should belong to X. tinctina (Mah. et Gillet) Hale and X. mexicana (Gyeln.) Hale, and P. subramigera Gyeln. to X. mexicana as well. Both P. stenophylla (Ach.) Heug. and P. subconspersa Nyl. from China belong to X. taractica (Kremph.) Hale. Moreover, some Chinese specimens of X. tinctina and X. taractica contain a trace of norstictic acid in addition to usnic and salazinic acids. P. camtschadalis (Ach.) Eschw. has been mistaken for P. vagans (Nyl.) Nyl. by most authors. Actually, P. camtschadalis (=X. camtschadalis) is quite different from P. vagans (=X. vagans) in morphological and chemical characters and geographical distributions as well. The former is always marked with yellowish or white lines and spots on the upper surface of lobes, and contains salazinic acid besides usnic acid. The type specimen (H-Ach. no. 1450, in H) was collected from Kamchatka in Asia. But the latter lacks yellowish or white lines and spots on the upper surface of lobes, and contains stictic and norstictic acids in addition to usnic acid. The type specimen (H-Nyl. no. 1730, in H) was collected from Ecuador in South America. The rest of this group from China in the literature remain to be revised in future.