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Agrocybe semiorbicularis (Bull.) Fayod 1889

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

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(Bull.) Fayod
Bull.
Fayod
1889
358
ICN
species
Agrocybe semiorbicularis

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semiorbicularis

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Agrocybe semiorbicularis (Bull.) Fayod 1889

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

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

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Agrocybe semiorbicularis (Bull.) Fayod 1889
Agrocybe semiorbicularis (Bull.) Fayod (1889)
Agrocybe semiorbicularis (Bull.) Fayod 1889
Agrocybe semiorbicularis (Bull.) Fayod (1889)
Agrocybe semiorbicularis (Bull.) Fayod 1889
Agrocybe semiorbicularis (Bull.) Fayod
Agrocybe semiorbicularis (Bull.) Fayod 1889
Agrocybe semiorbicularis (Bull.) Fayod (1889)
Agrocybe semiorbicularis (Bull.) Fayod 1889
Agrocybe semiorbicularis (Bull.) Fayod (1889)
Agrocybe semiorbicularis (Bull.) Fayod 1889
Agrocybe semiorbicularis (Bull.) Fayod (1889)
Agrocybe semiorbicularis (Bull.) Fayod 1889
Agrocybe semiorbicularis (Bull.) Fayod (1889)
Agrocybe semiorbicularis (Bull.) Fayod 1889
Agrocybe semiorbicularis (Bull.) Fayod 1889
Agrocybe semiorbicularis (Bull.) Fayod (1889)

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Agrocybe semiorbicularis (Bull.) Fayod 1889
[Not available]

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1cb17cda-36b9-11d5-9548-00d0592d548c
scientific name
Names_Fungi
1 January 2000
23 August 2012
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