Lactifluus sepiaceus (McNabb) Stubbe 2012

Caption:

Details

Name scientific

Lactifluus sepiaceus (McNabb) Stubbe in Stubbe et al., Mycotaxon 119 485 (2012)

Preferred name

Lactifluus sepiaceus (McNabb) Stubbe 2012

Taxonomy reference

Stubbe, D.; Wang, X.H.; Verbeken, A. 2012: New combinations in Lactifluus. 2. L. subg. Gerardii. Mycotaxon 119: 483-485.

Biostatus

Origin

Occurrence

Georegion

Schema

Biostatus source

Comment

Indigenous, non-endemic

Present

New Zealand

Political Region

Also present in Australia [JAC]

Nomenclature

Authors

(McNabb) Stubbe

Original authors

McNabb

Combination authors

Stubbe

Publication place

Stubbe, D.; Wang, X.H.; Verbeken, A. 2012: New combinations in Lactifluus. 2. L. subg. Gerardii. Mycotaxon 119: 483-485.

Year published

2012

Publication page

485

Nomenclatural code

ICN

Basionym

Lactarius sepiaceus McNabb 1971

Taxonomic rank

species

Canonical form

Lactifluus sepiaceus

Classification

Kingdom

Fungi

Phylum

Basidiomycota

Class

Agaricomycetes

Order

Russulales

Family

Russulaceae

Genus

Lactifluus

Species

sepiaceus

Vernacular names

Language of use: English

Chocolate Milkcap

Synonyms

Lactarius sepiaceus McNabb 1971

Associations

View full associations record

Association type

Associated organism

Association source

has host

Nothofagus fusca (Hook.f.) Oerst.

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

has host

Fuscospora solandri

PDD (1 records from New Zealand.)

has host

Fuscospora truncata

PDD (2 records from New Zealand.)

has host

Kunzea

PDD (1 records from New Zealand.)

has host

Leptospermum

PDD (1 records from New Zealand.)

has host

Lophozonia menziesii (Hook.f.) Heenan & Smissen 2013

PDD (1 records from New Zealand.)

has host

Nothofagaceae

PDD (1 records from New Zealand.)

has host

Nothofagus

PDD (3 records from New Zealand.)

has host

Nothofagus fusca (Hook.f.) Oerst.

PDD (3 records from New Zealand.)

has host

Nothofagus menziesii (Hook.f.) Oerst.

PDD (8 records from New Zealand.)

has host

Nothofagus solandri var. cliffortioides (Hook.f.) Poole

PDD (1 records from New Zealand.)

Descriptions

McNabb, R.F.R. 1971: The Russulaceae of New Zealand. 1. Lactarius DC ex S.F. Gray. New Zealand Journal of Botany 9(1): 46-66.

Lactarius sepiaceus McNabb 1971

Collections Examined

Under (1) N. fusca and N. menziesii. Nelson: Maruia, 23.iii.l966, J. A. McRobb, (holotype, PDD 26384); 23.iii.l966, R.F.R. McN.; (2) N. menziesii, Otago: Secretary Island, 10.ii.l960, R.F.R. McN.; Nelson: Little Wanganui, Blue Duck Creek, 13.L1968, R.F.R. McN.

The dry, pruinose, sombre coloured pileus

Description

pileus: 5- 12 cm diam., convex when young, centrally depressed to shallow-infundibuliform at maturity, dry, pruinose to subvelutinate under lens, azonate, rugulose or irregularly folded particularly near margins when young, conspicuously so when mature, dark greyish brown, sepia, or dark brownish black, often with glaucous patches; margins involute at maturity, entire, often undulate. Cuticle composed of erect, thin-walled, hyaline, septate, simple, ± filamentous elements to 80 µm long, 3-10 µm diam., with dark brown contents in KOH, originating from inflated, short-celled hyphae. lamellae: subdecurrent to decurrent, moderately crowded to subdistant, thick, simple, to 6 mm deep, pallid creamy white to pallid cream, typically with dark brown edges; lamellulae present in 2-3 unequal series; latex viscid, white to pallid creamy white, unchanging on exposure to air, drying pallid cream. stipe: 2-6 cm long, ± equal, 1-2.5 cm diam. stout, chambered to hollow at maturity, dry, pruinose to subvelutinate under lens, concolorous with pileus; flesh sordid white, unchanging. Cuticle similar to that of pileus. spores: spore print white; spores broadly elliptical to ovate-elliptical, obliquely and prominently apiculate, apiculus to 2.5-(3) µm long, 7.5-11 X 6.5-9.5 µm, ornamentation of fine to moderately coarse amyloid ridges to 1.2,µm high forming a complete or almost complete reticulum; plage weakly amyloid, indistinct. hymenium: basidia hyaline, subclavate to clavate, 55-80 X 7.5-10.5 µm, 4-spored, sterigmata to 11 µm long; pleurocystidia not seen; cheilocystidia numerous, filamentous, hyaline, thin-walled, septate, 30-65 X 4.5-7 µm; pseudocystidia sparse, scattered, originating from lactiferous hyphae, irregularly cylindrical, not or only slightly projecting beyond basidia, to 6 µm diam. hymenophoral trama: heteromerous, composed of lactiferous hyphae, rather loosely interwoven, short-celled connective hyphae, and sphaerocysts in the proximal half; subhymenium of closely interwoven connective hyphae, appearing cellular in section. context of pileus: white with very faint salmon pink tints on prolonged exposure to air, thick, firm, rather coarsely granular. smell: not distinctive. taste: lamellae and context mild. chemical characters: formalin - n.r.: phenol - slowly deep vinaceous; FeSO4 - rapidly salmon pink; guaiacol - salmon pink darkening to brick red; KOH on pileus - slight darkening; on context - faint yellow; NH4OH on pileus and context - n.r.

Habitat

Solitary or gregarious under Nothofagus

Latin

Pileus subtiliter infundibuliformis, 5-12 cm diam. siccus, rugosus, azonatus, phaco-brunneus vel sepiaceus. Lamellae decurrentes, ad 6 mm altae, pallide cremeo-albae, margines plerumque atrobrunneae; lamellulae adsunt; latex viscidus, albus. Stipes 2-6 cm longus, plus minusve aequalis, 1-2.5 cm diam., cavatus, siccus, concolor cum pileo. Sporae amyloides, late ellipticae, 7.5-11 X 6.5-9.5 µm, ornatae.

Notes

cuticular structure, and white latex indicate that this species belongs in sect. Plinthogali subsect. Fuliginosi as defined by Singer (1962), although Singer indicated that he was reluctant to include species with white spores in this section. In a monograph of the North American species of sect. Plinthogali, Smith and Hesler (1962) considerably expanded Singer's concept by the inclusion of species with white spores.

Lactarius sepiaceus is characterised by the dark brown pruinose to subvelutinate pileus and stipe, cream lamellae, and prominently apiculate spores with reticulate ornamentation.

Typification

holotype, PDD 26384