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Marasmius masoniae G. Stev. 1964

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Marasmius masoniae G. Stev., Kew Bull. 19 36 (1964)

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G. Stev.
G. Stev.
1964
36
as 'masonii'
ICN
Marasmius masoniae G. Stev. 1964
NZ holotype
species
Marasmius masoniae
HABITAT: inserted on fallen leaves of Nothofagus, [New Zealand], Arthur's Pass, 7.6.1954, Ruth Mason in Stevenson 984 K(M)

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masoniae

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Marasmius masoniae G. Stev. 1964

K(m) 235255 Stevenson 959. The description in Horak and Desjardin is taken from the notes assembled by Desjardin and accompanying the packet. The material has no rhizomorph remnants and so not M. kanukaneus. There are no cheilocystidia other than a few patches near the lamellar perimeiter which are an extension of the pileipellis ornamentation. I disagree there are scattered cystidia. I could find no mature spores, and relatively few immature spores. The stipitipellis is not dissimilar to M. gelatinospies. Unfortunately there isn't enough evidence to decide one way or the other but I strongly suspect this is the same as M. gelatinosipes and was collected in dry weather. Other similar specimens have sequences the same as putative M gelatinosipes. If so then obviosuly M. masoniae would provide the earlier name. However, given the uncertainty and the distinctive stem of M. gelatinospies in wet weather, it seems prudento to accept that name and treat this as a nom. dub. unless future sequences of recent collections confiorming to the Horak & Desjardin description indicate otherwise.

Marasmius masoniae G. Stev. 1964

Material examined. - NEW ZEALAND: South Island, Prov. Canterbury, Arthur's Pass, 7 VI 1954, R. Mason (Stevenson 959; Holotype, K).

No fresh material available for study. Description of macroscopic features adapted from the protologue and from details observed on the dried holotype. Description of microscopic features derived from analysis of the holotype specimen.

Pi1eus 1-3 mm diam, convex to campanulate, rugulose-striate; surface dull, dry, glabrous; fawn, dried buff.- Lamellae adnexed to adnate, subdistant, non-collariate, narrow, concolorous with the pileus.- Stipe 10-15 x 0.2 mm, central, cylindrical, equal, wiry, glabrous, tough, insititious, brown to black; rhizomorphs absent.- Data on odor and taste unavailable.
Basidiospores 7.5-8.5(-9.0) x 4.0-5.0 µm, ellipsoid, smooth, thin-walled, hyaline, inamyloid.- Basidia 23-28 x 6-7 µm , clavate, 4-spored.- Basidioles fusoid.- Cheilocystidia scattered, uncommon, like the pileipellis terminal cells.- Pleurocystidia absent.- Pileipellis a Rameales-structure with diverticulate terminal cells; main body of terminal cells 6-16 x 3-8 µm, poorly developed, subcylindrical to irregular in outline, rarely broadly clavate, often lobed, hyaline, thin-walled, non-gelatinous; diverticula 1.5-6.5(-8.0) x 1.0-1.5 µm, dense, erect, cylindrical to subconic, hyaline, thin-walled to thick-walled.- Pileal and lamellar trama hyphae non-incrusted, non-gelatinous, inamyloid, Stipe tissue monomitic; cortical hyphae 3-6 µm diam, cylindrical, brown, roughened with pigment incrustations, dextrinoid.- Caulocystidia absent.-Clamp connections present.

Habit, habitat and distribution.- Scattered on leaves and twigs of Nothofagus. New Zealand.
Marasmius masonii forms very small, fawn to buff colored pilei, subdistant, narrow lamellae, a glabrous, brown, insititious stipe lacking rhizomorphs, relatively broad basidiospores (4-5 µm ), diverticulate cheilocystidia, a Rameales-type pileipellis, no caulocystidia, and growth on Nothofagus debris. It is allied with M. kanukaneus G. Stevenson and M. yalae Singer. Marasmius kanukaneus (#32 below), also described from New Zealand, differs in forming a darker pileus, wiry black rhizomorphs associated with basidiomes, and much narrower basidiospores (2.5-3.5 µm) (Holotype: K!). Marasmius yalae, described from Argentina and reported in Part I of this series from Papua New Guinea, differs primarily in forming much narrower basidiospores (2.5-3.0 µm), lacks pigment-incrusted stipe cortical hyphae, and sporulates on leaves of Alnus and Araucaria (Holotype: F!). Stevenson (1964) reported the basidiospores of M. masonii as measuring 5 x 3 µm; our analysis of the holotype specimen indicate the basidiospores are larger, measuring 7.5-9.0 x 4-5 µm. Another Australasian species, M. lignyodes Berk., with similar sized basidiospores (viz. 8.0-9.5 x 4.0-4.8 µm), differs in forming a much darker brown pileus with dense brown pigment incrustations, and forms basidiomes on leaves of Eucalyptus (Holotype: K!).

Marasmius masoniae G. Stev. 1964

[Notes from Kew Type specimen, PRJ 2010] K label cites as being on fallen leaves of Nothofagus, in fact all appear to be on fallen twigs

Marasmius masoniae G. Stev. 1964

Pileus 1-3 mm diam., fawn, bell shaped, smooth. Gills adnate fawn. Stipe 10-15 x 0-2 mm, brown to black, thread-like, glabrous, grooved. Spores 5 x 3 µm non-amyloid (Fig. 16). Epicutis of finely branched hyphal endings.
Inserted on fallen leaves of Nothofagus, Arthur's Pass, 7.6.1954, Ruth Mason in Stevenson (type).
Pileus 1-3 mm diam., hinnuleus, campanulatus, laevis. Lamellae adnatae, hinnuleae. Stipes 10-15 x 0-2 mm, brunneus usque niger, filiformis, glaber, sulcatus. Sporae 5 x 3 µm, haud amyloideae. Epicutis ex hypharum termination bus tenuiter ramosis sistens.
Typus: R. Mason in Stevenson 959.

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Marasmius masoniae G. Stev. 1964
Marasmius masoniae G. Stev.
Marasmius masoniae G. Stev. 1964
Marasmius masoniae G. Stev. (1964)
Marasmius masoniae G. Stev. 1964
Marasmius masoniae G. Stev. (1964)
Marasmius masoniae G. Stev. 1964
Marasmius masoniae G. Stev. (1964)
Marasmius masoniae G. Stev. 1964
Marasmius masoniae G. Stev. 1964
Marasmius masoniae G. Stev. 1964
Marasmius masoniae G. Stev. 1964
Marasmius masoniae G. Stev. 1964
Marasmius masoniae G. Stev. (1964)
Marasmius masoniae G. Stev. 1964
Marasmius masoniae G. Stev. (1964)
Marasmius masoniae G. Stev. 1964
Marasmius masoniae G. Stev. (1964)
Marasmius masoniae G. Stev. 1964
Marasmius masoniae G. Stev. (1964)
Marasmius masoniae G. Stev. 1964
Marasmius masoniae G. Stev. 1964
Marasmius masoniae G. Stev. (1964)
Marasmius masoniae G. Stev. 1964
Marasmius masoniae G. Stev. (1964)

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Marasmius masoniae G. Stev. 1964
[Not available]

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typification
HABITAT: inserted on fallen leaves of Nothofagus, [New Zealand], Arthur's Pass, 7.6.1954, Ruth Mason in Stevenson 984 K(M)

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1cb1924b-36b9-11d5-9548-00d0592d548c
scientific name
Names_Fungi
1 January 2000
25 August 2021
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