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Gymnomyces leucocarpus T. Lebel 2002

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Gymnomyces leucocarpus T. Lebel, New Zealand J. Bot. 40 497 (2002)

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T. Lebel
T. Lebel
2002
497
ICN
Gymnomyces leucocarpus T. Lebel 2002
NZ holotype (PDD 69223)
species
Gymnomyces leucocarpus
New Zealand, South Island, Buller, Murchison, Matakitaki Bridge Scenic Reserve, R. E. Beever, 10 Aug 1998, PDD 69223

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leucocarpus

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Gymnomyces leucocarpus T. Lebel 2002

OTHER SPECIMENS EXAMINED: SOUTH ISLAND: BULLER: Nelson Lakes National Park, Lake Rotoiti, R. E. Beever, 23 Apr 1986, PDD 55482. NELSON: Glenhope-Tapawera Rd, J. Trappe 12606 & M. Amaranthus, 25 Sep 1992, MEL 2063483, OSC.
Basidiomata 12-22 x 8-20 mm, subglobose to slightly irregular. Peridial surface dry, smooth, with some shallow pitting, white. Gleba white to ivory, loculate, chambers minute, crowded, compacted to appear almost solid. Stipe absent. Columella absent or present as a faint trace of sterile tissue near base, not percurrent. Odour and taste mild, not distinctive. Latex absent. Peridiopellis 6-13 µm wide, a thin ixocutis of repent to patchily upright, tightly interwoven, gelatinised, hyaline hyphal tips 2-5 µm diam. Peridial context 50-90 µm wide, of interwoven, hyaline hyphae 2-3 µm diam. and scattered, septate, inflated hyphae 3-5.5 µm diam. Sphaerocysts and endocystidia absent. Hymenophoral trama 10-22 µm wide, of tightly interwoven, hyaline hyphae 2-4 µm diam. and scattered, inflated hyphae 4-6 µm diam., sphaerocysts absent. Subhymenium 9-14 µm wide, of branched hyphae with some inflated cells forming 1-2 tiers of irregular cells 5-8 µm diam. Basidia 25-32 x 10-12 µm, hyaline, clavate to cylindrical, with 2, 3, and 4 sterigmata 4-7 µm long. Cystidia 25-42 x 8-11 µm, clavate to cylindrical with obtuse apices, hyaline, rare. Spores 7-9 x 7-8.6 µm (8.55 ± 0.34 x 8.1 ± 0.5), Q = 1.03-1.11, globose to subglobose, orthotropic. Ornamentation amyloid, crowded, of isolated spines ± 1 µm high. Hilar appendix small, hyaline, central; plage present, inconspicuous, the ornamentation slightly lower around plage. Spore colour in mass white.
HABITAT AND DISTRIBUTION: Hypogeous, in small clusters under leaf litter in Nothofagus menziesii, N. fusca, and N. solandri forests. Fruiting period Aug-Sep.
Gasterocarpus 12-22 x 8-20 mm, subglobosus vel irregularis. Peridium albidum. Gleba albida velebernea, loculata. Stipes nullus; columella nulla. Peridiopellis tenuissima, ex hyphis agglutinatis. Basidia 25-32 x 10-12 µm, 2 vel 4 sporigera. Cystidia 25-42 x 8-11 µm, rara. Sporae 7-9 x 7-8.6 µm, globosae vel subglobosae, spinis aggregatis ad ± 1 µm altis amyloidibus ornatis.

ETYMOLOGY: The specific epithet refers to the white basidiomata, from the Greek leuco meaning white.

NOTES: Gymnomyces leucocarpus can be distinguished from other species of Gymnomyces in New Zealand by the white peridium (with no hint of other colours), isolated spinose spore ornamentation, and rarity of the hymenial cystidia. The abundant ornamentation of isolated spines ±1 µm high of G. leucocarpus is similar to that of several collections of Gymnomyces and Cystangium from Australia, which are Eucalyptus associates, and Macowanites rubroluteus, a Nothofagus associate from New Zealand (Lebel 1998). The Australian collections differ from G. leucocarpus microscopically, in the structure of the peridiopellis, basidial shape, and more globose spores with longer spines. The pale yellow peridium with red patches of M. rubroluteus differentiates it from the white peridium of G. leucocarpus.

HOLOTYPUS (hic designatus): New Zealand, South Island, Buller, Murchison, Matakitaki Bridge Scenic Reserve, R. E. Beever, 10 Aug 1998, PDD 69223.

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Gymnomyces leucocarpus T. Lebel 2002
Gymnomyces leucocarpus T. Lebel (2002)
Gymnomyces leucocarpus T. Lebel 2002
Gymnomyces leucocarpus T. Lebel (2002)
Gymnomyces leucocarpus T. Lebel 2002
Gymnomyces leucocarpus T. Lebel (2002)
Gymnomyces leucocarpus T. Lebel 2002
Gymnomyces leucocarpus T. Lebel (2002)

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Gymnomyces leucocarpus T. Lebel 2002
[Not available]

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typification
New Zealand, South Island, Buller, Murchison, Matakitaki Bridge Scenic Reserve, R. E. Beever, 10 Aug 1998, PDD 69223

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9a6c6d14-ce52-4435-8654-01c1c8f57ec0
scientific name
Names_Fungi
29 October 2002
16 November 2017
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