Polyporus exiguus Colenso 1885 [1884]

Details

Name scientific

Polyporus exiguus Colenso, Trans. & Proc. New Zealand Inst. 17 266 (1885 [1884])

Preferred name

Tenuipostia dissecta (Cooke) B.K. Cui & Shun Liu 2022

Nomenclature

Authors

Colenso

Original authors

Colenso

Publication place

Colenso, W. 1885: A list of fungi recently discovered in New Zealand. Transactions and Proceedings of the New Zealand Institute 17: 265-269.

Year published

1885

Year on publication

1884

Publication page

266

Nomenclatural code

ICN

Basionym

Polyporus exiguus Colenso 1885 [1884]

Type locality

NZ holotype

Taxonomic rank

species

Canonical form

Polyporus exiguus

Typification

Type New Zealand, wet woods near Norsewood, Waipawa County; 1883 : W.Colenso

Classification

Kingdom

Fungi

Phylum

Basidiomycota

Class

Agaricomycetes

Order

Polyporales

Family

Polyporaceae

Genus

Polyporus

Species

exiguus

Descriptions

Cunningham, G.H. 1948: New Zealand Polyporaceae. 3. The genus Polyporus. New Zealand Department of Scientific and Industrial Research, Plant Diseases Division, Bulletin. 74.

Polyporus exiguus Colenso 1885 [1884]

Collections Examined

Agathis australis Salisb. Auckland. Karekare, Waitakere Ranges, Sept. 1946, Joan Dingley; Sprague's Hill, Henderson, 200 feet, May 1947, Joan Dingley; Anawhata Road, Waitakere Ranges, 1,000 feet, Aug. 1947, Joan Dingley. Unknown Hosts. Auckland. Whatipu, Manakau Harbour, 600 feet, Nov. 1930, M.Hodgkins. Wellington. Track to Ohakune Hut, Mt. Ruapehu, 3,000 feet, April 1935, E.E.Chamberlain; Pohangina Valley, Ruahine Ranges, Dec. 1932, E.E.Chamberlain; Lake Papaetonga, 30 feet, Aug. 1919, G.H.C.; Butterfly Gully, Aug. 1946, G.B.Rawlings. Otago. Puerua, Sept.1934, Helen Dalrymple.

Description

Hymenophore annual, solitary or in crowded groups, laterally attached by a small stem-like base. Pileus simple or compound, 2-15 mm. x 5-15 mm. x 0.5-1 mm., white, ochre, fawn or umber; surface concolorous, markedly radiate-striate, even, polished or delicately tomentose in depressions, cuticle wanting, replaced by imbricate parallel hyphe of which a few possess pigmented contents; margin acuminate, revolute, crenate and toothed; hymenial surface grey or cinnamon, even, sterile margin 1 mm. wide, dissepiments not toothed. Context 0.2-0.6 mm. thick, clay colour or isabelline, of radiately arranged parallel hyphae ; generative hyphae 5-6 µ thick, wall 2 µ, sparsely branched, septate, with abundant conspicuous clamp connections. Pores decurrent, irregular in shape and size, angular, seldom round, to 1 mm. deep, clay colour in section, 50-150 µ diameter, or 4-6 per mm.; dissepiments 75-150 µ thick, mostly 100 µ, equal, of woven hyphae, apex finely velutinate. Basidial type clavate, basidia clavate, 12-14 x 3-4 µ. Spores oblong, elliptical, or pip-shaped, 3-4.5 x 2-2.5 µ, smooth, hyaline.

Distribution

New Zealand.

Habitat

Growing on decorticated rotting logs lying on the forest floor, often amongst moss.

Notes

Specimens forwarded to Kew by W.Colenso were named by M.C.Cooke. The name was published by Colenso as Polyporus exiguis sp. nov., but no description was appended. Subsequently Cooke formally described it as Polystictus exiguis Cke.

Specific characters are the small size, laterally attached flabelliform pilei, white (when fresh) surface, irregular moderately sized pores, and small elliptical spores. Pilei of a few specimens resemble those of P. catervatus in that they are peziza-like, caespitose and attached by a prolongation of the vertex. Such may be separated by the larger more deeply coloured pores, entire dissepiments and elliptical spores.

Though superficially not apparent, the species belongs to the same section as P. anthracophilus, possessing a monomitic hyphal system, and similar radiately arranged parallel hyphae.

Typification

TYPE LOCALITY: Norswood, Hawkes Bay, New Zealand.

Johnston, P.R. 2010: Kew Type Specimens - images and notes from P.R. Johnston, 2010.