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Mycena podocarpi Segedin 1991

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Mycena podocarpi Segedin, New Zealand J. Bot. 29 51 (1991)
Mycena podocarpi Segedin 1991

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Endemic
Present
New Zealand
Political Region

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Segedin
Segedin
1991
51
ICN
Mycena podocarpi Segedin 1991
NZ holotype
species
Mycena podocarpi

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podocarpi

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Mycena podocarpi Segedin 1991

MATERIAL: New Zealand: North I.: Taupo: track to Lake Rotopounamu, B. P. Segedin and G. M. Taylor, 22 v l973, PDD 56706 (holotypus), GMT 838(isotypus, icon.)
Pileus 12-25 mm diam., brownish violet (11D4 K&W) to blackish granular in the centre, hemispheric to convex, finally slightly depressed in the middle, smooth, pellucid striate more than halfway in from the margin. Lamellae broadly attached with a decurrent tooth, brownish purple with a paler bloom and distinctly blackish margin, fairly distant, 3 series,     -16 reaching the stipe, relatively broad, some intervening. Stipe 40-50 X 2-3 mm, fairly even but slightly wider at the base, dark reddish purple, finely fibrillose, hollow, insititious. Flesh pale grey-lilac. Smell and taste not noticeable. Spore print white. Spores 5.5-7.5 X 3-5 (6.7 X 3.75) µm., Q = 1.78, ellipsoid-oblong, hyaline, strongly amyloid, thin-walled, variable in size but falling into approximately two sizes 6.1 X 3.4 µm. and 7.3 X 4.2 µm., probably depending upon being borne on 2- or 4-spored basidia. Basidia 20-25 X 6-7 µm., 2- or 4-spored, with faint reddish-coloured sap when fresh (brown in KOH). Cheilocystidia 20-35 X 10-15 µm., forming a broad band, extending back across the lamellar face, basically clavate, with diverticulate, mainly apical outgrowths, which may be intricately branched, containing reddish-brown sap, paler in the outgrowths. Pleurocystidia fairly frequent, like the cheilocystidia with similar reddish-brown sap, only smaller and with less complex outgrowths. Trama of more or less parallel hyphae up lo 10 µm. diam., fairly regular, all containing red sap, very strongly vinaceous brown in Melzer's. Subhymenium cellular. Pileipellis of repent hyphae up to 5 µm. diam. and with red sap, forming a uniform layer, with many narrow (1-3 µm.), hyaline, simple to diverticulate, relatively long, erect outgrowths. Subpellis of globose cells (15-25 µm. diam.), with brownish-coloured sap. Context of narrow to inflated, interwoven hyphae with reddish contents. Stipe of narrow, parallel hyphae bearing some short, diverticulate branches with reddish-brown sap. Clamp connections present.
HABITAT: Caespitose on wood in mixed podocarp, Weinmannia, Elaeocarpus forest.
Pileus 12-25 mm latus, hemisphaericus vel convexus, fusco purpureus vel ater-granulosus in centro. Lamellae adnatae, fusco purpureae, atro marginatae, nonnullae intervenosae. Stipes 40-50 X 2-3 mm, roseo purpureus, cylindricus, insititius. Caro griseo lilacina. Sporae 5.5-7.5 X 3-5 µm., ellpsoideae oblongae, hyalinae, valde amyloideae. Basidia bi- aut tetraspora. Cheilocystidia clavata, roseo fusca, diverticulis hyalinis ad apicem instructa. Pleurocystidia cheilocystidiis similia. Trama ex hyphis cum succo rubro, vinosa in Melzer. Pileipellis ex hyphis repentibus cum diverticulis. In ligno putrido podocarpi. Novazelandia.

ETYMOLOGY: Named after the podocarp wood on which it was collected

The violet colour of the basidiomes and the very dark lamellar margin, together with the reddish-coloured plasmatic pigment of most internal tissues are very distinctive.

M. austroavenacea, M. lividorubra, and M. podocarpi form a group of closely related, brightly-coloured species, all with lamellar margins distinctively dark-coloured and homogeneously sterile: cheilocystidia basically clavate, with long, often contorted excrescences; spores small and amyloid; basidia 2-4-spored. M. oratiensis stands a little apart in having an umbonate pileus, more strongly decurrent lamellae; larger spores; 4-spored basidia, and nodulose pileipellis elements. All bat M. austroavenacea grow on wood.

Microscopically the affinities of these fungi appear to lie with the M. olivaceomarginata (Massee apud Cooke) Massee group, which Maas Geesteranus (1986b) describes as a very variable species, which may appear in a number of colour forms. The main difference is the much smaller spore size of the Southern Hemisphere species compared with the Northern ones. The original description of M. olivaceomarginata by Massee, both in the text (Cooke 1883) and on the figure in Cooke (1881, pl. 1153 (959)), gives the spore size as "6 X 5 µm." (Close to the size for the Southern species) and this has never been reconciled with all later records for this species of approximately 9-13 X 5-7 µm. Recently, Singer (1989) has described a new species of Mycena from Brazil, M. castaneomarginata Sing., which appears , to have many of the microscopic characters of the New Zealand species, including the small spores (6.5-7.5 X 4-4.5 µm.), but is a much smaller fungus and lacks the bright colours. In a field identification key to some Victorian (Australia) species of Mycena, Grgurinovic & Holland (1982) referred to a new species, M. erythromyces nom.inal., which appears from the meagre morphological description to resemble M. oratiensis, no microscopic details were supplied for comparison.

HOLOTYPUS: PDD 56706.

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Mycena podocarpi Segedin 1991
Mycena podocarpi Segedin (1991)
Mycena podocarpi Segedin 1991
Mycena podocarpi Segedin (1991)
Mycena podocarpi Segedin 1991
Mycena podocarpi Segedin (1991)
Mycena podocarpi Segedin 1991
Mycena podocarpi Segedin (1991)
Mycena podocarpi Segedin 1991
Mycena podocarpi Segedin (1991)
Mycena podocarpi Segedin 1991

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Mycena podocarpi Segedin 1991
New Zealand
Auckland
Mycena podocarpi Segedin 1991
New Zealand
Buller
Mycena podocarpi Segedin 1991
New Zealand
Northland
Mycena podocarpi Segedin 1991
New Zealand
Taupo
Mycena podocarpi Segedin 1991
New Zealand
Wellington

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taxonomic status
type is macroscopically and microscopically identical to M. lividorubra. [JAC]

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1cb19453-36b9-11d5-9548-00d0592d548c
scientific name
Names_Fungi
1 January 2001
27 August 2002
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