New Zealand Fungarium - Te Kohinga Hekaheka o Aotearoa

PDD 27106

Holotype

Packet

06 June 2001

24 February 2023

Agaricus horakii Heinem.

Agaricus horakii Heinem.

Basidiomycota

Agaricomycetes

Agaricales

Agaricaceae

Determination

Holotype

sandy soil

Unknown

Kaihoka Reserve

Latitude and Longitude (WGS84):  -40.5532  172.602 

Kaihoka Reserve

E. Horak

Egon Horak

1968/05/10

1968-05-10

New Zealand

Nelson

Ngāti Apa ki te Rā Tō

Ngāti Kōata

Ngāti Kuia

Ngāti Rārua

Ngāti Tama ki Te Tau Ihu

Ngāti Toa Rangatira

Te Atiawa o Te Waka-a-Māui

New Zealand Map Grid:  2476100E 6072530N  (WGS84 -40.552912 172.599934)

Heinemann's paper has ... A. bambusae var. australis=PDD27106=69/194 A. viridopurpurascens=PDD27107=68/79 A. horakii=PDD27110=68/411 A. lanatoniger=PDD27111=67/225 A. purpureoniger=PDD27109=68/435 A. oligocystis=PDD27108=69/87 PDD has ... A. bambusae var. australis=PDD27102=69/194 A. viridopurpurascens=PDD 27103=68/79 A. horakii=PDD 27106=68/411 A. lanatoniger=PDD 27107=67/225 A. purpureoniger=PDD 27105=68/435 A. oligocystis=PDD 27104=69/87(corrected from 82) We must assume the paper has the incorrect PDD numbers.
J.A. Cooper, Apr. 2016

Protologue: Cap 6-7 cm in diameter, thick (8 mm at half-radius), broadly mammifom; pileipellis dark brown, dry, Woolly-felty, fibrilose in patches; margin Shortly overhanging with appendiculate hairs. Stipe 3-5 cm X 10-12 mm, cylindrical, a little thickened at the base which reaches 15 mm, soft hollow, whitish to light brownish, fibrillose; Ring (partial veil!) below brownish, often incomplete and broken into irregular zones, with a narrow free part located in the lower 1/3. Gills initially pink then, very quickly, chocolate brown very dark, almost black, fragile, packed, wide (7 mm), free and even a little separated [from stipe]. Edge finely fimbriate, lighter. Flesh, whitich, pinkish brown in the cap and cortical part of the stipe, showing a reddish line above the lamellae; Odorless; Sweet flavor. Dark brown spores. Exsiccatum dark brown; Slides almost black, with rare and small efflorescences, especially on the lamellae. Dark brown spores 5.4-6.6 x 3.2-3.9um, opaque, ellipsoid or nearly oval; without a pore. Basides 4-spored, claviform 18-21 x 6.7-7um. Cheilocystidia abundant, hyaline, thin-walled, smooth, claviform (10)15-25 x 6.5-8.5um sometimes supported by an additional +- claviform element. Trama regular, with long vesicular elements to 15-33 um diameter. Pileipellis a cutis, smooth, thin-walled; Elements cylindrical ± detersile; Frequent secondary branching; terminal elements rounded at the extremity; Brown plasmatic pigment. Observations: i. - Species characterized by its brown coating Its stout appearance, its fragile ring formed entirely by the partial veil. 2 The morphologically nearest species is perhaps A. lanipes which has a similar apperance but has a tenacious ring and a woolly coating under the ring or the veil generally in the form of many beads. Let us note here that the different authors, who have written about A. lanipes, give it varying spore dimensions which seems to indicate confusion Of species. 3. The woolly aspect of the cap makes us classify this species in the subgenus Lanagaricus, without being able to assign to it a specific section. Let us note that the stipe hardly qualifies it for this subgenus and one could admit that A. horakii, just as A. lanipes, occupies an intermediate position between subgenera Agaricus and Lanagaricus.
J.A. Cooper, Mar. 2017

The pileus is dark brown, not especially flocculose/lannose. Spores length=5.9-6.7µm (µ=6.3, σ=0.22), width=3.3-4.0µm (µ=3.7, σ=0.22), Q=1.6-1.9µm (µ=1.73, σ=0.09), n=24. Cystidia not observed. The material fits the description, except for cystidia. There has been no sample swap with PDD27102
Nov. 2017

KP705083 - 5.8S ribosomal RNA, internal transcribed spacer 1

Mitchell, A. D.; Walter, M. (1999)Species ofAgaricusoccurring in New Zealand.New Zealand Journal of Botany37(4)715-725. DOI: 10.1080/0028825X.1999.9512665

Received