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Lachnum pteridicola (Dennis) Spooner 1987

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Lachnum pteridicola (Dennis) Spooner 1987
Lachnum pteridicola (Dennis) Spooner 1987

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Endemic
Present
New Zealand
Political Region

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(Dennis) Spooner
Dennis
Spooner
1987
452
as 'pteridicolum'
ICN
NZ holotype
species
Lachnum pteridicola

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pteridicola

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Apothecia sparsa, superficilia, subsessilia; disco rufo-brunneo, concavo, 1-2 mm. lato; receptacula atro-brunnea, extus pilis levibus fuscis, obtusis, flexuosis, scabriusculis, septatis, 130 x 4 µobsita, pedicule sat breve, Asci clavati, octospori, 45 x 4 µ, apice jodo coerulescentes; ascosporae distichae, fusoideae, continuae, 6-7 x 1 µ paraphyses lanciformes, 1.5-2 µ cr.
In petiolis emortuis Cyatheae dealbatae, Waiatarua, Waitakere ranges, Auckland, Nov. 1948, Dingley 18980 (typus).
[Notes from Kew Type specimen, PRJ 2010] Type material in Kew scanty, in poor condition

Lachnum pteridicola (Dennis) Spooner 1987

NEW ZEALAND: Auckland, Waiatarua, Waitakere Ranges, on Cyathea dealbata, xi 1948, leg. J.M. Dingley, PDD 18980 (Holotype, K).
APOTHECIA superficial, scattered or gregarious, subsessile or very short-stipitate. DISC 1-2 mm diam., plano-concave, reddish-brown, smooth, with the margin somewhat inrolled when dried. RECEPTACLE patellate, concolorous with or slightly darker than the disc, rather densely clothed with pale yellowish-brown hairs. HAIRS 70-120(-150) x 3-4 µm, longest near the margin, cylindric, flexuous, obtuse at the tip, thick-walled, septate, granulate throughout and bearing scattered particles of brownish amorphous matter which dissolve in Melzer's reagent. ASCI most 45-50 x 4-5 µm, 8-spored, cylindric-clavate, conical at the apex the small pore stained blue in Melzer's reagent. ASCOSPORES 5.5-8.0 x 1.0-1.3, mean 6.6 (SD 0.6) x mean 1.1 (SD 0.1) µm, hyaline, cylindric, sometimes slightly clavate, rounded at the ends, non-septate, containing 2 small polar guttules, biseriate. PARAPHYSES lanceolate, pointed at the apex, (2.0-)2.5-3.0 µm diam. at the broadest part, sparsely septate, hyaline or faintly pigmented, exceeding the asci by usually less than 10 µm. MEDULLARY EXCIPULUM composed of interwoven, mostly thin-walled, septate, hyaline or pale yellowish hyphae 2.0-2.5 µm diam. ECTAL EXCIPULUM composed of hyaline or pale brown prismatic or somewhat inflated cells, narrower and more deeply pigmented towards the surface, having thin or somewhat thickened walls up to 1.5 µm thick, and mostly measuring 12-18 x 6-9 µm. They lie in rows at a low angle to the surface.
On dead stipes of Cyathea dealbata (Forst.f.) Swartz. Known only from the type collection

The type material is, unfortunately, rather scanty and I have not examined microtome sections for details of the excipular structure. The walls of the ectal cells are mostly thickened and somewhat refractive, but the structure is otherwise quite characteristic of the genus.

This is a distinctive species which may be readily recognized by the reddish-brown disc, small spores and yellow-brown hairs. The latter have thickened walls which appear also to have a secondary internal thickening so that the lumen is very reduced and appears as a narrow central band. The granulation on the walls of the hairs is continuous but uneven, being coarser in patches, particularly near the apex. In addition the walls are encrusted by small, irregular particles of brownish, resinous matter which appear insoluble in distilled water but readily dissolve in Melzer's reagent.

It is uncertain to which species L. pteridicolum is most closely allied. Two tropical pteridicolous species, Dasyscyphus ulei (Winter) Saccardo and D. chermesinus Cash have red discs and are closely related to each other but differ from L. pteridicolum in having smaller apothecia, much larger, fusoid spores and, hyaline, thin-walled hairs. They are discussed by Haines (1980).

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Lachnum pteridicola (Dennis) Spooner 1987
Lachnum pteridicola (Dennis) Spooner
Lachnum pteridicola (Dennis) Spooner 1987
Lachnum pteridicola (Dennis) Spooner (1987)
Lachnum pteridicola (Dennis) Spooner 1987
Lachnum pteridicola (Dennis) Spooner (1987)

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Lachnum pteridicola (Dennis) Spooner 1987
[Not available]

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taxonomic status
Phylogenetically a species of Lachnopsis

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1cb19000-36b9-11d5-9548-00d0592d548c
scientific name
Names_Fungi
15 December 2003
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