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Mycena interrupta (Berk.) Sacc. 1887

Scientific name record
Names_Fungi record source
Is NZ relevant
This is the current name
This record has collections
This record has descriptions
This is indigenous

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Indigenous, non-endemic
Present
New Zealand
Political Region

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(Berk.) Sacc.
Berk.
Sacc.
1887
299
ICN
Tas., Australia
species
Mycena interrupta

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interrupta

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[Notes from Kew Type specimen, PRJ 2010] Other collections at K Stevenson GS 1362
MATERIAL: New Zealand: North I.: Taupo: on track to Lake Rotopounamu, B. P. Segedin, 30v 1980, PDD 56709 (holotypus); Auckland: Kauri Glen Park, Northcote, J.S.Croxall, 17 vi 1971, PDD 29302; Clarke's Bush, Titirangi, Waitakere Rd., J. M. Dingley & W. Versluys, 5 v 1976, PDD 34786 (in part); Gisborne: Tawa Tr., L. Waikaremoana, P. X. C. Austwick, 1 iii 1970, PKCW 1972 (icon.).
Pileus up to 14 mm diam., almost spherical, resting on the basal disc, when young; as the stipe elongates it becomes convex to shallow umbilicate when older, sulcate, pellucid striate at margin, straw-coloured to darker greenish-yellow in depressed centre; greenish cottony flecks over surface when young, confined to depressed centre when older; distinctly viscid, probably with a separable pellicle. Lamellae free, apparently not attached to a collar, creamy white with a darker, strongly fimbriate edge, thin, crowded, 2 series, 20 reaching the stipe. Stipe up to 15 X 1-2 mm, even above a conspicuous basal disc, white at top, slightly yellow towards the base, densely covered with caulocystidia (villose), hollow; disc lined with a mat of hairs and with a black margin and under surface in most specimens. Stipe breaks off readily at the base and the disc persists, attached to the substratum, for some time. Smell and taste unknown.

Colour of spore print unknown.

Spores 8-11 X 5.5-7 (9.4 X 6.3) µm., Q = 1.49, ellipsoid, hyaline, thin-walled, strongly amyloid. Basidia 15-18 X 6-8.5 µm., short and fat, 2- to 4-spored, sterigmata relatively long (up to 4-5 µm.). Cheilocystidia 35-40 X 3-7 µm., forming a broad band of closely packed, thin-walled, fusiform to narrowly clavate cells, mostly with a smooth apex but sometimes with 1-4 µm. small apical protuberances, yellow-brown plasmatic pigment. Gill edge gelatinised. Pleurocystidia absent. Trama of more or less parallel, narrow (2-3 µm.) hyphae, vinescent-red in Melzer's. Context of thick-walled hyphae of fairly regular cells (15 X 7 µm.), not inflated, vinescent-red in Melzer's. Pileipellis very complex; suprapellis of narrow, gelatinised hyphae, probably separable, with scattered, large bundles of thin-walled hairs; pellis of narrow (5-6 µm.) hyphae with short, sometimes diverticulate protuberances often terminating in inflated cells (10-15 µm. diam.) bearing large numbers of short (1-4 µm.) to long (-10 µm.) protuberances. Beneath the pellis is a subpellis of mostly spherical (4.5-5 µm. diam.) to short cylindrical (9-16 µm. long) elements with very thick (up to 3 µm. wide) walls. Stipe of narrow hyphae, the cortex bearing many long, thick-walled, tapering caulocystidia (85-140 X 6-12 µm. at the base, 2-4 µm. diam. at the tips, some distinctly swollen at the base). In the middle of the stipe are a few conducting hyphae with yellow (KOH), shining contents. Disc consists of thick-walled, hyaline hyphae 4 µm. diam., with a brown, resinous, encrusting pigment; the dark colour at the edge and underside of the disc appears to be due in part to colonies of blue-green algae. No clamp connections seen.

HABITAT: Gregarious, on dead wood in mixed podocarp-dicotyledonous forest.

Pileus 14 mm latus, sphaericus dein convexus dein depressus, sulcatus, stramineus vel viridiflavus in centro, viridifloccosus in juventute, viscidus. Lamellae liberae sine collo, cremea, margine fuscata et fimbriata. Stipes 15 X 1-2 mm, aequus, villosus, disco basali. Sporae 8-11 X 5-5.7 µm., ellipsoideae, hyalinae, valde amyloideae. Basidia bi-aut tetraspora. Cheilocystidia 35-40 X 3-7 µm., coarctata, fusiformia, laevia vel aliquando ramosa in apicem; lamella margine gelatinosa, pleurocystidia nulla. Tramaet contextus vinosus in Melzer. Pileipellis complexa; suprapellis gelatinosa, pilis fasciculatis; pellis ex hyphis repentibus cum brevibus diverticulis aut protuberationibus cum diverticulis; subpellis ex cellulis aliquot globosis, parietibus crassissimis. Caulocystidia 85-140 X 6-12 µm., angustiuscula, tumida pauca, parietibus crassis. Discus hyphis incrassatis, pigmento incrustante resinaceo. Fibulae nullae. In ligno putrido. Novazelandia.

ETYMOLOGY: The epithet of the new species reflects the almost completely spherical form of the young basidiome.

At first sight, the assigning of this fungus to any section as presently defined raises some problems. The well-developed disc at the base of the stipe and gelatinous pellicle suggest section Basipedes but it would be excluded on account of its green colour (Maas Geesteranus 1980). Maas Geesteranus has not included section Cyanocephalae in his Conspectus, presumably because it comprises only Southern Hemisphere species. This section was introduced by Singer in 1975 but not legitimised until 1986 (Singer 1986), to accommodate three blue to blue-green species; M. cyanocephala Sing., (S. America) M. interrupta (Berk.) Sacc. (Australia), and M. veneta Stev. (New Zealand), all of which Horak (1983) considers to be the same species, namely M. interrupta.

M. globuliformis can be confused with M. interrupta, even when it is found on the same log (PDD 34786), but, when looked at critically, the pileus is seen to be more yellowish-green on a straw-coloured background, rather than blue-green, which would exclude it from section Cyanocephalae. The situation is further confused by the presence of blue-green algae at the edge of the disc, which, when moist, may give a distinctly blue-green colour. The appropriate place for M. globuliformis appears to be section Longisetae, despite the absence of pileal setae and the amyloidity of the spores. There are, indeed, many resemblances to M. longiseta Hohnel, such as structure of the pileipellis, the cheilocystidia and the disc, and the long setiform hairs on the stipe. Although there are no pileal setae, the subpellis in M. globuliformis is composed of conspicuously thick-walled cells very much like the basal cells, which are extended into setae in M. longiseta. Another species of Mycena, M. sublongisetae Z.-s. Bi, has recently been described from China. This differs from M. globuliformis in its larger size, its yellow-brown pileus and orange-yellow lamellae, but it resembles it in having slightly amyloid spores; the pileal setae are intermediate in size between the other two species. The discovery of a third species related to M. longiseta reinforces the segregation of section Longisetae from section Basipedes.

HOLOTYPUS: PDD 56709
Pileus 5-12 mm diam., prussian blue fading to yellowish-green, darker at centre, striate at margin, convex with slight central depression, translucent, very viscid; flesh thin, bluish-green. Gills free, moderately crowded, shallow, creamy to pale bluish-green, margins white at first becoming dark bluish-green, minutely fringed. Stipe 15-25 x 1-2 mm, pale bluish-green, to pale ochraceous, smooth and slightly viscid, translucent, bluish-green basal disc. Spores 9-11 x 6-7 µm, amyloid, thin-walled (Fig. 42); print white. Hymenophoral trama strongly pseudo-amyloid. Cheilocystidia are balloon-cells which may become filled with pigment, or which may be collapsed and somewhat gelatinized.
On fallen rotting logs, Kapakapanui, 23.11.1946, A. P. Druce; Waiopehu, 23.11.1946, E. Cone; Keith George Park, 30.5.19491 Stevenson (type); Otari, 7.6.1958, Stevenson.
Pileus 5-12 mm diam., caeruleus prussicus, in luteo-viridem pallescens, medio fusciore, margine striato, convexus cum depressione levi centrali, translucens, valde viscidus; caro tenuis, caeruleo-viridis. Lamellae liberae, modice confertae, baud altae, cremeae usque pallide caeruleo-virides, marginibus primum albis deinde fusco-caeruleo-viridibus minute fimbriatis. Stipes 15-25 x 1-2 mm, pallide caeruleo-viridis usque pallide ochraceus, laevis, leviter viscidus, translucens, disco basali caeruleo-viridi. Sporae 9-11 x 6-7 µm, amyloideae, parietibus tenuibus, in cumulo albae. Trama hymenophoralis valde pseudo-amyloidea. Cheilocystidia (cellulae vesiculosae) vel pigmento repleta vel collapsa et subgelatinosa.
Typus: Stevenson 600.

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Agaricus interruptus Berk. (1859) [1860]
Mycena interrupta (Berk.) Sacc. 1887
Mycena interrupta (Berk.) Sacc. 1887
Mycena interrupta (Berk.) Sacc. 1887
Mycena interrupta (Berk.) Sacc. 1887
Mycena interrupta (Berk.) Sacc. (1887)
Mycena interrupta (Berk.) Sacc. 1887
Mycena interrupta (Berk.) Sacc. (1887)
Mycena interrupta (Berk.) Sacc. 1887
Mycena interrupta (Berk.) Sacc. (1887)
Mycena interrupta (Berk.) Sacc. 1887
Mycena interrupta (Berk.) Sacc. (1887)
Mycena interrupta (Berk.) Sacc. 1887
Mycena interrupta (Berk.) Sacc. (1887)
Mycena interrupta (Berk.) Sacc. 1887
Mycena interrupta (Berk.) Sacc. (1887)
Mycena interrupta (Berk.) Sacc. 1887
Mycena interrupta (Berk.) Sacc. (1887)
Mycena interrupta (Berk.) Sacc. 1887
Mycena interrupta (Berk.) Sacc. (1887)
Mycena interrupta (Berk.) Sacc. 1887
Mycena interrupta (Berk.) Sacc. (1887)
Mycena interrupta (Berk.) Sacc. 1887
Mycena interrupta (Berk.) Sacc. (1887)
Mycena interrupta (Berk.) Sacc. 1887
Mycena interrupta (Berk.) Sacc. (1887)
Mycena interrupta (Berk.) Sacc. 1887
Mycena interrupta (Berk.) Sacc. 1887
Mycena interrupta (Berk.) Sacc. (1887)
Mycena interrupta (Berk.) Sacc. 1887
Mycena interrupta (Berk.) Sacc. (1887)
Mycena veneta G. Stev. 1964
Mycena interrupta (Berk.) Sacc. 1887
Mycena veneta G. Stev. (1964)
Mycena interrupta (Berk.) Sacc. 1887

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New Zealand
Mid Canterbury
Mycena interrupta (Berk.) Sacc. 1887
New Zealand
Auckland
Mycena interrupta (Berk.) Sacc. 1887
New Zealand
Bay of Plenty
Mycena interrupta (Berk.) Sacc. 1887
New Zealand
Buller
Mycena interrupta (Berk.) Sacc. 1887
New Zealand
Mid Canterbury
Mycena interrupta (Berk.) Sacc. 1887
New Zealand
Nelson
Mycena interrupta (Berk.) Sacc. 1887
New Zealand
North Canterbury
Mycena interrupta (Berk.) Sacc. 1887
New Zealand
Rangitikei
Mycena interrupta (Berk.) Sacc. 1887
New Zealand
Stewart Island
Mycena interrupta (Berk.) Sacc. 1887
New Zealand
Taupo
Mycena interrupta (Berk.) Sacc. 1887
New Zealand
Wairarapa
Mycena interrupta (Berk.) Sacc. 1887
New Zealand
Wellington
New Zealand
Stewart Island
New Zealand
Wellington

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1cb1b4d8-36b9-11d5-9548-00d0592d548c
scientific name
Names_Fungi
1 January 2001
15 December 2003
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