A NSW Government website

Hygrocybe anomala var. ianthinomarginata (an agaric fungus) - vulnerable species listing

06 Sep 2002

The Scientific Committee, established by the Threatened Species Conservation Act, has made a Final Determination to list Hygrocybe anomala var. ianthinomarginata A. M. Young, an agaric fungus, as a VULNERABLE SPECIES in Schedule 2 of the Act. The listing of vulnerable species is provided for by Part 2 of the Act.

NSW Scientific Committee - final determination

The Scientific Committee has found that:

1. Hygrocybe anomala var.  ianthinomarginata A. M. Young  (Fungi, Basidiomycota, Agaricales, Hygrophoraceae) is a small, brightly-coloured gilled fungus. It is described by Young (1999): Pileus 8-18mm, convex to expanded convex or sometimes slightly umbonate, orange brown (5B4-4A3) or buff (4A3-4B4) and almost always with a darker, reddish centre ‘dot’ (7A8) especially as the pileus matures, smooth, dry, finely scaly under a x10 lens, striate, margins strongly crenulate and tinted lavender/lilac/violet (12A2-14A2). Lamellae decurrent, pale lilac (12A2-14A2) sometimes deeper lavender/violet (16A3-16A4) and occasionally with pinkish tints, margins even and concolorous, thick, distant, veins present on the pileus undersurface. Stipe 20-40 x 1.5-2.5mm, red, reddish orange or orange (5A7, 7A8-8A8), smooth to finely fibrillose, dry, hollow, cylindrical. Spores (6.0-)6.7-8.7(-10.0)x4.0-5.7(-6.0)µm, Q:1.4-2.2, mean Q:1.7, smooth, hyaline, ovoid or ellipsoid to cylindrical and at least some cylindrical spores medially constricted, Spinose spores scattered frequently, occasionally or sometimes infrequently amongst the normal spores and having similar overall dimensions and Q’s to those of normal spores, outline frequently polygonal with the spines emerging from the angles of the polygon, spines conical, apices obtuse and 0.5-2.5µm in height. Basidia 33-57x6-8µm, mean 44x7µm, Q:5.0-8.0, mean Q:6.1, 4-spored, clamped. Cystidia absent. Hymenophoral trama regular to subregular, in the upper 2/3rds of the lamella composed of parallel chains of cylindrical, hyaline, thin walled elements 10-45 x 4-11µm but then becoming irregular and the lower 1/3 of the lamellae near the margins composed of subglobose to polyhedral, hyaline, thin walled elements 4-12µm diameter, clamps present but sometimes rare. Pileipellis a cutis composed of repent, hyaline, thin walled cylindrical hyphae 2-5µm diameter, clamps present. Stipitipellis a cutis of repent, thin walled, hyaline, cylindrical septate hyphae 1-4µm diameter, clamps occasional.

2. Hygrocybe anomala var.  ianthinomarginata A. M. Young is known from its type locality in Lane Cove Bushland Park in the Lane Cove Local Government Area in Sydney, and from Royal and Blue Mountains National Parks.

3. The occurrence of this species in the Lane Cove Bushland Park appears to be very limited. The species does not produce basidiomes (above-ground fruiting structures) all year, but non-reproductive hyphal structures occur below ground.

4. Hygrocybe anomala var.  ianthinomarginata A. M. Young is likely to be threatened by water-borne pollutants. Industrial pollutants occur particularly in the upper reaches of Gore Creek in Lane Cove Bushland Park, and domestic contaminants arise from residential properties on the perimeter of the Park. The species is also likely to be at risk from encroachment by exotic weeds, dumping of rubbish and garden refuse, excess pedestrian traffic in areas where hyphae or basidiomes occur, and inappropriate bush regeneration measures that disturb the forest canopy and native understorey plants.

5. In view of the above, the Scientific Committee is of the opinion that Hygrocybe anomala var.  ianthinomarginata A. M. Young is likely to become endangered unless the circumstances and factors threatening its survival or evolutionary development cease to operate.

Dr Chris Dickman
Chairperson
Scientific Committee

Gazettal date: 06/09/02
Exhibition period: 06/09/02 – 11/10/02

Reference

Young, A.M. (1999). The Hygrocybeae (Fungi, Basidiomycota, Agaricales, Hygrophoraceae) of the Lane Cove Bushland Park, New South Wales. Austrobaileya 5(3): 535-564

Contact us

Threatened Species Scientific Committee

Email: [email protected]