Marasmius masoniae G. Stev. 1964

Details

Name scientific

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

Preferred name

Collybiopsis masoniae (G. Stev.) E. Horak 1971

Nomenclature

Authors

G. Stev.

Original authors

G. Stev.

Publication place

Stevenson, G. 1964: The Agaricales of New Zealand: V. Kew Bulletin 19(1): 1-59.

Year published

1964

Publication page

Orthography

as 'masonii'

Nomenclatural code

ICN

Basionym

Marasmius masoniae G. Stev. 1964

Type locality

NZ holotype

Taxonomic rank

species

Canonical form

Marasmius masoniae

Typification

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

Classification

Kingdom

Fungi

Phylum

Basidiomycota

Class

Agaricomycetes

Order

Agaricales

Family

Marasmiaceae

Genus

Marasmius

Species

masoniae

Associations

View full associations record

Association type

Associated organism

Association source

has host

Nothofagus

Desjardin, D.E.; Horak, E. (1997)

has host

Nothofagus

McKenzie, E.H.C.; Buchanan, P.K.; Johnston, P.R. (2000)

Descriptions

Cooper, J.A. 2014-: Studies of New Zealand agaric type collections not deposited in PDD (unpublished).

Marasmius masoniae G. Stev. 1964

Description

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.

Desjardin, D.E.; Horak, E. 1997: Marasmius and Gloiocephala in the South Pacific Region: Papua New Guinea, New Caledonia, and New Zealand taxa. Bibliotheca Mycologica. 168.

Marasmius masoniae G. Stev. 1964

Collections Examined

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

Description

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.

Habitat

Habit, habitat and distribution.- Scattered on leaves and twigs of Nothofagus. New Zealand.

Notes

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!).

Johnston, P.R. 2010: Kew Type Specimens - images and notes from P.R. Johnston, 2010.

Marasmius masoniae G. Stev. 1964

Notes

[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

Stevenson, G. 1964: The Agaricales of New Zealand: V. Kew Bulletin 19(1): 1-59.

Marasmius masoniae G. Stev. 1964

Description

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.

Habitat

Inserted on fallen leaves of Nothofagus, Arthur's Pass, 7.6.1954, Ruth Mason in Stevenson (type).

Latin

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.

Typification

Typus: R. Mason in Stevenson 959.