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 Marasmius masoniae
SynonymsCollybiopsis masoniae
BiostatusPresent in region - Indigenous. Endemic
Images (click to enlarge)
Caption: 181-Collybiopsis masonii: a. cuticle (2000 x ). |  |
Article: Stevenson, G. (1964). The Agaricales of New Zealand: V. Kew Bulletin 19(1): 1-59.
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).
Article: 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: 152 p.
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!).
Article: Horak, E. (1971). A contribution towards the revision of the Agaricales (Fungi) from New Zealand. New Zealand Journal of Botany 9(3): 403-462 (http://www.rsnz.org/publish/abstracts.php).
Notes: Marasmius masonii Stevenson (29 D) Fig. 15 = Collybiopsis masonii
(Stevenson) comb. nov. (Basionym: M. masonii Stevenson, Kew Bull. 19: 36,
1964)
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