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Go to the NZFungi website for more indepth information on Hygrophoropsis aurantiaca. Hygrophoropsis aurantiaca

Synonyms

Hygrophoropsis coacta
Agaricus aurantiacus
Clitocybe aurantiaca
Cantharellus aurantiacus

Biostatus

Present in region - Indigenous. Non endemic

Images (click to enlarge)

 

Caption: ZT8573
Owner: E. Horak: © Creative Commons Attribution-Noncommercial 3.0 New Zealand

Caption: Dried type specimen
Owner: Herb PDD

Caption: Dried type specimen
Owner: Herb PDD

Caption: Hygrophoropsis coacta: spores.

Owner: Karl Soop
 

Article: McNabb, R.F.R. (1969). The Paxillaceae of New Zealand. New Zealand Journal of Botany 7(4): 349-362 (http://www.rsnz.org/publish/abstracts.php).
Description: PILEUS: plano-convex when young, becoming centrally depressed or shallowly infundibuliform at maturity, 1.5-5 cm diam., dry, subglabrous or extremely finely felted, pallid yellow, pallid orange-yellow, or occasionally with faint apricot tints; cuticle composed of more or less repent, loosely interwoven, thin-walled, filamentous hyphae 4.5-8.5 µm. diam. with conspicuous clamp connections; margins strongly involute when young, moderately involute and often undulate and irregularly lobed at maturity. LAMELLAE: moderately crowded, deeply decurrent, repeatedly dichotomously branched 3-5 times, edges acute or occasionally bluntly rounded, 1-1.5 mm deep, pallid orange, salmon, or pallid yellowish orange at maturity. STIPE: 1.5-4 cm long, subequal or tapering basally, 3-8 mm diam. apically, 2-5 mm diam. basally, central or somewhat eccentric, solid or stuffed, dry, glabrous, subglabrous, or faintly longitudinally felted, concolorous with lamellae or sordid yellowish orange; veil absent. SPORES: spore print not obtained; spores hyaline or faintly yellowish in KOH, pseudoamyloid, broadly elliptical, short cylindrical with obtuse ends, or occasionally subreniform, minutely apiculate, germ pore absent, 5.8-7.2-(8.5) X 3.2-4.2 µm. slightly thick-walled, smooth. HYMENIUM: basidia hyaline, subclavate to clavate, 20-28 X 5-6.5 µm., 4-spored; cystidia absent but a few sterile, paraphysis-like structures present, projecting to 10 µm. beyond basidia. HYMENOPHORAL TRAMA: bilateral, mediostratum of subparallel or loosely interwoven hyphae, lateral stratum of closely packed, irregular, non-divergent hyphae; clamp connections present. CONTEXT OF PILEUS: white or tinted yellow, extremely soft, unchanging on exposure to air. TASTE: not distinctive.
Habitat: HABITAT: Gregarious under Leptospermum and Nothofagus.
Notes: Hygrophoropsis coacta closely resembles H. aurantiaca (Wulf. ex Fr.) Maire but differs in the glabrous, subglabrous or finely felted pileus and stipe. In H. aurantiaca, both pileus and stipe are velutinate to tomentose and the cuticle is formed by a trichodermium of interwoven, erect hyphae.
The organization of the hymenophoral trama is not easy to determine, as lamellae tend to split down the line of the mediostratum. However, the tramal hyphae are organised into an axial mediostratum and a closely packed lateral stratum as described for the genus by Singer (1962) and are not without organisation as indicated by Corner (1966). Singer's interpretation of the hymenophoral trama of Hygrophoropsis has been supported by the observations of Reid (1967).
H. coacta may be recognised by the pallid yellow, orange-yellow, or apricot tinted fruitbodies, repeatedly dichotomously branched lamellae, and the short pseudoamyloid spores. The characteristic colours of fresh fruitbodies are largely retained on drying.

Article: Horak, E. (1980) [1979]. Paxilloid Agaricales in Australasia. Sydowia 32: 154-166.
Notes: Two well developed collections of H. coacta McNabb have been made in New Zealand. All macro- and microcharacters observed indicate that this fungus is conspecific with H. aurantiaca (Fr.) a wide spread species both in the northern hemisphere (Bigelow 1975: 63) and in temperate South America (Singer 1964: 98). According to Corner (1966: 132) H. aurantiaca (Fr.) is already reported from Australia and for that reason the New Zealand records extend the area of distribution in Australasia.