Agrocybe semiorbicularis (Bull.) Fayod 1889

Details

Name scientific

Agrocybe semiorbicularis (Bull.) Fayod, Ann. Sci. Nat., Bot., 7e Sér. 9 358 (1889)

Preferred name

Agrocybe pediades (Fr.) Fayod 1889

Taxonomy reference

Legon, N.W.; Henrici, A. 2005: Checklist of the British & Irish Basidiomycota. Kew.

Nomenclature

Authors

(Bull.) Fayod

Original authors

Bull.

Combination authors

Fayod

Publication place

Fayod, V. 1889: Prodrome d'une histoire naturelle des Agaricinés. Annales des Sciences Naturelles, Botanique, 7e Série 9: 181-411.

Year published

1889

Publication page

358

Nomenclatural code

ICN

Basionym

Agaricus semiorbicularis Bull. 1789

Taxonomic rank

species

Canonical form

Agrocybe semiorbicularis

Classification

Kingdom

Fungi

Phylum

Basidiomycota

Class

Agaricomycetes

Order

Agaricales

Family

Hymenogastraceae

Genus

Agrocybe

Species

semiorbicularis

Descriptions

Watling, R.; Taylor, G.M. 1987: Observations on the Bolbitiaceae: 27. Preliminary account of the Bolbitiaceae of New Zealand. Bibliotheca Mycologica. 117.

Agrocybe semiorbicularis (Bull.) Fayod 1889

Collections Examined

As Agaricus pediades, Napier, Colenso b 113 pro parte & b 269; as Agaricus semiorbicularis, Napier, Colenso 1053.

Description

No descriptions of the macroscopic characters are available for New Zealand collections and therefore the determination is based solely on microscopic characters. For the characters of basidiomata in the field readers are referred to European literature, e.g. Walling (1982). A. semiorbicularis is delimited by the following combination of microscopic characters:

a. Broadly ellipsoid to ovoid basidiospores 10.5-14 x 7-8(-10) µm,

b. Basidia mostly 2-spored,

c. Absence of pleurocystidia and

d. Lageniform cheilocystidia with ± subcapitate head.

It is widespread on lawns and in grasslands. Details of the New Zealand collection are as follows;-

Basidiospores 14-16 x (8-)8.5-ll µm, ellipsoid-ovoid, medium ochraceous in water, darker in aqueous alkali, smooth; germ-pore distinct. Basidia 2-spored, a few 3- and 4-spored basidia seen, 25-30 x 7.5-10 µm. Cheilocystidia 20-30 x 5-7.5 µm, ampulliform with slightly swollen obtuse apex (3-5 µm broad); pleurocystidia absent. Caulocystidia subcapitate to slightly swollen at apex, 20-30 x 6-8 µm, apex 4-5 µm.

Notes

Agaricus semiorbicularis is recorded in the literature by both Colenso (1890) and Massee (1898).