Hourangia Xue T. Zhu & Zhu L. Yang, in Zhu et al., Mycol. Progr. 14(no. 37): 3 (2015)
Etymology: “Hou” and “rang” mean “thick” and “hymenium” in Chinese, respectively, referring to the relatively thick hymenophore.
Basidioma stipitate-pileate with tubular hymenophore. Pileus hemispherical, convex to applanate, sometimes umbonate; surface densely covered with yellow-brownred-brown or dull brown granular squamules when young, becoming rimose-diffract to small tufted squamulose with age, dry; context whitish, cream-colored to yellowish, first bluish or indistinctly bluish, then reddish to brownish red, finally brownish to blackish when injured. Hymenophore adanate, sinuate or slightly decurrent; thickness of hymenophore 3–5 (7) times that of pileal context at the position halfway to the pileus center; hymenophoral surface flesh yellow to dull yellow, staining blue when injured; pores compound, angular; tubes concolorous with hymenophoral surface, staining blue when injured. Stipe central, pale yellow-brown, pale red-brown to dirty pale brown, nearly smooth, sometimes finely fibrillose; context dirty white to yellowish, first typically becoming bluish, then reddish to brownish red, and finally brownish to blackish when exposed; basal mycelia whitish. Pileipellis a trichoderm composed of cylindrical or tumid cells; terminal cells short cylindrical or subglobose. Pleuro and cheilocystidia lanceolate to clavate or ventricose, thin walled. Basidiospores subfusiform, brownish yellow, with bacillate ornamentation (under SEM), rarely only partially ornamented. Clamp connections absent in all tissues.
Index Fungorum number: IF810695
Type species: Hourangia cheoi (W.F. Chiu) Xue T. Zhu & Zhu L. Yang 2015, in in Zhu et al., Mycol. Progr. 14(no. 37): 5 (2015)
Hourangia cheoi (W.F. Chiu) Xue T. Zhu & Zhu L. Yang 2015
Hourangia microcarpa (Corner) G. Wu, Xue T. Zhu & Zhu L. Yang 2015
Hourangia nigropunctata (W.F. Chiu) Xue T. Zhu & Zhu L. Yang 2015
Hourangia pumila (M.A. Neves & Halling) Xue T. Zhu, Halling & Zhu L. Yang 2015
Zhu XT, Wu G, Zhao K, Halling RE, Yang ZL. 2015. Hourangia, a new genus of Boletaceae to accommodate Xerocomus cheoi and its allied species. Mycological Progress. 14(6/37):1-10