Amanita sinocitrina - Amanitaceae.org - Taxonomy and Morphology of Amanita and Limacella
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name Amanita sinocitrina
name status nomen acceptum
author Zhu L. Yang, Z. H. Chen & Z. G. Zhang
english name "Chinese Citrin Bulbous Amanita"
intro The information below is based on the original description of this species.
cap The fruiting bodies of A. sinocitrina are small to medium-sized.  The cap is 40-60 mm wide, convex to applanate, gray-yellow, sometimes brownish, with indistinct, innate, radial fibrils.  It is covered with grey to brownish, verrucose to floccose, felty, volval patches; its flesh is white, but turns brownish when exposed, especially in the bulb.
gills The gills of this species are free to subfree, crowded, white to cream-colored; and the short gills are attenuate and of diverse lengths.
stem The stipe is 60 - 90 × 5 - 10 mm, subcylindric to attenuate upwards; its surface is white to dirty white, covered with yellowish to yellow squamules above the annulus, and with whitish to grayish squamules or fibrils below the annulus; the stipe's basal bulb is 15 - 25 mm wide, subabrupt to abrupt, marginate, with the upper margin covered with grayish to brownish, verrucose to floccose volval remnants..  The annulus is membranous and superior to nearly medium, with its upper surface cream-colored to yellowish and lower surface whitish to grayish or brownish.
spores Spores of A. sinocitrina measure (5.5-) 6.0 - 7.5 (-8.0) × (5.0-) 5.5 - 7.0 (-7.5) µm and are globose to subglobose, and amyloid.  Clamps are not present on the bases of basidia.
discussion Amanita sinocitrina was originally described from central China.  It occurs in mixed forests ith broad-leaved trees and conifers.  Its distribution range is still unknown.

Amanita sinocitrina is characterised by its small to medium-sized basidiome with a gray-yellow pileus, grey to brownish volval remnants, a whitish to yellowish annulus, a subabrupt to abrupt, marginate bulb on the base of the stipe, and small basidia and spores.  It is related to taxa such as A. mappa (Batsch) Fr.  However, A. sinocitrina differs from the European A. mappa by its differently colored pileus with somewhat darker colored volval remnants, smaller basidia and significantly smaller spores.

Amanita sinocitrina is also similar to A. citrina var. grisea (Hongo) Hongo, A. lavendula (Coker) Tulloss et al., A. brunnescens G. F. Atk., A. brunnescens f. straminea E.-J. Gilbert, A. aestivalis Singer ex Singer and A. asteropus Sabo ex Romagn.  However, A. citrina var. grisea, described from Japan, has a darker colored pileus, pallid yellow annulus, larger basidia and larger spores.  Amanita lavendula, originally described from the U.S. and other similar taxa in North America are distinguished from A. sinocitrina by, among other features, its lavender staining fruiting body and (in the case of A. lavendula) somewhat smaller spores.  Amanita brunnescens from eastern North America usually has larger basidiomes with brown, innate radial lines on the pileus covered with whitish to pallid volval remnants, a white stipe with a usually longitudinally cleft bulb, longer basidia, and larger spores.  Amanita brunnescens f. straminea has a differently colored pileus and stipe, and larger spores.  Amanita brunnescens var. pallida and A. aestivalis, both described from eastern North America, have a paler colored pileus, a longitudinally splitting bulb, larger basidia and larger spores.  Amanita asteropus, described from Europe, has a differently colored pileus with differently colored volval remnants, and without innate, radial fibrils, a longitudinally splitting bulb, trama or surface of stipe turning rapidly brown-orange when injured, and larger spores.—Zhu L. Yang and R. E. Tulloss
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