|
 Marasmius perpusillus
BiostatusPresent in region - Indigenous. Endemic
Images (click to enlarge)
Caption: Fig. 7 (1-6). Marasmius perpusillus Desjardin & E. Horak (PDD, holotype).- 1. Basidiomes.- 2.
Basidiospores.- 3. Basidia.- 4. Hymenial cystidia.- 5. Caulocystidia.- 6. Pileipellis. | 
Caption: scale=2mm
Owner: J.A. Cooper | 
Caption: spores, basidium and cheilocystidia
Owner: J.A. Cooper | 
Caption: upper: cap cells. middle: cap cells on cap perimeter. Lower: caulocystidia
Owner: J.A. Cooper | 
Caption: Dried type specimen
Owner: Herb PDD |
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: Pileus 1-2 mm diam, hemispherical or convex when young, expanding with age to campanulate
with a depressed to subumbilicate disc; surface dull, dry, glabrous; white. Texture membranaceous;
context very thin.- Lame11ae absent; hymenophore smooth, vein-like or subrugose, decurrent on
stipe; white.- Stipe 3-18 x 0.2-0.3 mm, central, cylindrical, equal, fragile, minutely pruinose overall,
insititious; white or translucent overall.- Odor and taste not distinctive.
Basidiospores 7.0-8.0 x 4.0-4.5 µm, ellipsoid, smooth, thin-walled, hyaline, inamyloid.- Basidia 18-21 x 5-6 µm, subclavate, 4-spored, clamped.- Hymenia1 cystidia uncommon, 35-45 x 7-9 µm,
lageniform-subcapitate, hyaline, thin-walled, rarely apically thick-walled.Pileipellis hymeniform,
composed of Globulares-type cells, 20-30 x 1022 230m, broadly clavate to subglobose, thin-walled, hyaline; pileocystidia absent.- Pileal and 1amellar tissue inamyloid.- Stipe tissue monomitic;
hyphae parallel, cylindrical, smooth, hyaline, inamyloid.- Caulocystidia rudimentary, 10-20 x 3-5
µm, as cylindrical or irregular outgrowths, hyaline, thin-walled-. Clamp connections present.
Habitat: Habit, habitat and distribution.- Solitary, in groups on rotting leaves of Elaeocarpus dentatus
(Elaeocarpaceae). New Zealand.
Notes: Marasmius perpusillus is characterized by very small basidiomes with white, convex-subumbilicate pileus 1-2 mm diam, a smooth, decurrent hymenophore, pure white insititious
stipe, relatively small basidiospores, uncommon lageniform-subcapitate hymenial cystidia, poorly
developed, cylindrical caulocystidia, and the absence of pileocystidia. These features indicate
placement in sect. Epiphylli, subsect. Epiphyllini. The species is similar to M. pusillissimus
Desjardin & Petersen, differing by the features presented in the key. Marasmius perpusillus is not
closely allied with any known temperate Northern Hemisphere taxa.
|