New species and records of Pyxine (Caliciaceae) in China Author Yang, Mei-Xia Author Wang, Xin-Yu Author Liu, Dong Author Zhang, Yan-Yun Author Li, Li-Juan Author Yin, An-Cheng Author Scheidegger, Christoph Author Wang, Li-Song text MycoKeys 2019 45 93 109 http://dx.doi.org/10.3897/mycokeys.45.29374 journal article http://dx.doi.org/10.3897/mycokeys.45.29374 1314-4049--93 Pyxine minuta Vain Description. Pyxine minuta is characterised by narrow lobes, centrally subcrustaceous, saxicolous thalli, a whitish-grey or grey-brown upper surface; brownish-black lower surface with black and simple rhizines, a lack of isidia and soredia and a white or whitish stramineous medulla. Apothecia common, 0.5-1.5 mm wide; internal stipe absent or not distinct. Upper cortex K+ yellowish, UV+ yellow, medulla K- , C- ; containing lichexanthone (major) and terpenoids (detected by TLC). Habitat and distribution. Growing on bark of Quercus spp. or rock around 1090-2230 m elevation in semi-arid environments. Worldwide distribution: India ( Awasthi 1982 ), Australia ( Rogers 1986 ) and newly recorded in China. Notes. There is some confusion in the classification of Pyxine minuta and P. pyxinoides . Pyxine minuta is characterised by narrow lobes, an absent or indistinct internal stipe, small spores (11-16 (18) x 5-7 μm ) and a white medulla. Based on the world key to Pyxine species with lichexanthone ( Aptroot et al. 2014 ; Kalb 1987 ; Huneck et al. 1987 ), the characteristics of Pyxine pyxinoides are: Thallus without isidia, pustules or soredia, usually with apothecia; Medulla yellow, ochraceous or salmon; apothecium margin black, not thalline; apothecium without a clear stipe; one TLC run of a portion of the thallus without apothecia showed traces of a substance running like norstictic acid ( Obermayer and Kalb 2010 ); neotropical. We did not find any specimens of P. pyxinoides in our collections. Selected specimens examined (KUN). CHINA: SICHUAN PROVINCE: Dukou Co., Dabaoding, 1950 m elev., 21 Jun 1983, L. S. Wang 83-206. YUNNAN PROVINCE: Yongsheng Co., Shawan village of Renhe town, 1160 m elev., 26°19.449'N , 101°05.200'E , on rock, 7 Dec 2013, L. S. Wang et al. 13-40630, 13-40695; Yongren Co., Lagu village, 1050 m elev., 26°23.239'N , 101°25.120'E , on rock, 4 Dec 2013, L. S. Wang et al. 13-41380; Jinggu Co., on the way to Zhenyuan, 1800 m elev., 21 Aug 1994, L. S. Wang et al. 94-14247.