Download Copy a link to this page Cite this record

Cortinarius olivaceoniger (E. Horak) G. Garnier 1991

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
Show more

Click to collapse Details Info

Cortinarius olivaceoniger (E. Horak) G. Garnier 1991
Cortinarius olivaceoniger (E. Horak) G. Garnier 1991

Click to collapse Biostatus Info

Endemic
Present
New Zealand
Political Region

Click to collapse Nomenclature Info

(E. Horak) G. Garnier
E. Horak
G. Garnier
1991
256
ICN
species
Cortinarius olivaceoniger

Click to collapse Classification Info

olivaceoniger

Click to collapse Descriptions Info

NEW ZEALAND: South Island: Nelson, Lake Rotoiti, track to St. Arnaud Range, under N. fusca-menziesii-solandri var. cliffortioides 30.IV.1968, leg. HORAK, PDD 27179, holotype (ZT 68/322, isotype). - Canterbury, Craigieburn Range, Broken River, near FRES Camp, under N. solandri var. cliffortioides, 19.VI.1968, leg. HORAK (ZT 68/273).
Pileus - 40 mm, convex to broadly umbonate or obtusely campanulate; fuliginous or olive-brown at centre, towards margin turning olive-yellow or bright yellow; subgelatinous to viscid, striate margin when moist, hygrophanous, conspicuous veil remnants absent. - Lamellae l0-26, -7, emarginate, subdecurrent with tooth, -6 mm wide; dark yellow (with greenish tinge) turning yellow-rust brown; edges concolorous, entire. - Stipe-70 x -4 (-13 at base) mm, slender, fusoid to subbulbous towards base, rarely cylindrical, single; yellow to olive-yellow, occasionally with yellow rhizoids; glutinous from base to evanescent cortina, longitudinally fibrillose in dry conditions, solid becoming hollow. - Context olive-brown in pileus and stipe, yellow beneath stipe's cuticle. - Odour and taste raphanoid (or like raw potatoes). - Chemical reactions  on pileus and stipe: KOH - red to red-brown; HCl, NH3 negative. Spore print rust brown. - Spores 7.5-9 x 4.5-5 µm, elliptical, minutely verrucose, with coarse warts at apex, rarely with distinct perispore, rust-brown. -Basidia 25-35 x 6-8 µm, 4-spored. - Cheilocystidia none. - Pileipellis an ixocutis composed of cylindrical, gelatinized, entangled hyphae (2-6  µm diam.), subcutis cellular, with red-brown encrusting and plasmatic pigment, readily dissolving in KOH (solvent stains red-purple). - Clamp connections present.
On soil in Nothofagus-forests. - New Zealand.
Pileus -40 mm, ex convexo obtuse campanulatus, olivaceofuligineus ad apicem, luteus marginem versus, glutinosus. Lamellae emarginatae, aureae. Stipes -70 x -4 (-13) mm, fusoideus vel subclavatus, luteus (olivaceo tinctu), glutinosus. Odor saporque raphanoidei. KOH - rubrobrunneus. Sporae 7.5-9 x 4.4-5 µm, ellipticae, minute verrucosae. Cystidia nulla. Ad terram in silvis nothofagineis. Novazelandia.
D. olivaceonigra closely resembles the more common D. alienata by similar habit, the presence of olive-green pigments (in both taxa KOH-spot test red!), the glutinous to viscid pileus and the occurrence in Nothofagus-forests. The two species, however, are distinguished by the size of the spores (larger in D. olivaceonigra) and the number and variety of anthraquinonoid pigments (KELLER & al., 1988). In D. olivaceonigra the olive-yellow colour of the carpophores is partly caused by endocrocin which lacks in the pigment chart of D. alienata.
Holotypus PDD 27179.

Click to collapse Collections Info

Cortinarius olivaceoniger (E. Horak) G. Garnier 1991
New Zealand
Bay of Plenty
Cortinarius olivaceoniger (E. Horak) G. Garnier 1991
New Zealand
Buller
Cortinarius olivaceoniger (E. Horak) G. Garnier 1991
New Zealand
Nelson
Cortinarius olivaceoniger (E. Horak) G. Garnier 1991
New Zealand
North Canterbury
Cortinarius olivaceoniger (E. Horak) G. Garnier 1991
New Zealand
Taupo

Click to collapse Notes Info

taxonomic status
Described with beech but one Horak collection and several subsequent collections with tea-tree. Unrelated to C. alienatus [JAC]

Click to collapse Metadata Info

51f76ec5-7d79-4159-be45-7876bd8593a2
scientific name
Names_Fungi
1 June 2004
13 October 2022
Click to go back to the top of the page
Top