New Zealand Fungarium - Te Kohinga Hekaheka o Aotearoa

PDD 26577

Holotype

Packet

11 April 2011

24 February 2023

Russula rimosa

R.F.R. McNabb

Russula rimulosa Pennycook

Basidiomycota

Agaricomycetes

Russulales

Russulaceae

Determination

Holotype

has host Leptospermum ericoides

ground

Leptospermum ericoides

Kunzea ericoides (A.Rich.) Joy Thomps.

Tracheophyta

Magnoliopsida

Myrtales

Myrtaceae

Determination

no

Unknown

Henderson Valley, Sharps Bush

Latitude and Longitude (WGS84):  -36.8998  174.581 

Henderson Valley, Sharps Bush

R.F.R. McNabb

Robert F. R. McNabb

RFRM 59 (Russula)

1967/04/06

1967-04-06

New Zealand

Auckland

Ngāti Tamaoho

Ngāti Whātua

Ngāti Whātua o Ōrākei

Te Ākitai Waiohua

Te Kawerau a Maki

New Zealand Map Grid:  2649840E 6476340N  (WGS84 -36.904229 174.564906)

[McNabb:] Holotype #59, gp 9. same as 24, 67(PDD26544), 24(PDD26575, 70(PDD26578), 46(PDD26576). PILEUS: 7 cm diam., shallowly infundibuliform, dry, glabrous, no indications of velar remnants, innately pruinose under hand lens, rather cracked near margins and slightly tangentially adpressed scaly in places (?der weather), dark brown in centre, (c 6E4 paling towards margins to c 5D4-E4). Margins not radially marked. GILLS: moderately crowded, rather thick, brittle, pallid creamy white, not discoloured at maturity, to 7 mm deep, lamellae simple or occasionally forked close to stipe, not forked at margins, lamellulae occasionally present but in no particular sequence. STIPE: 4 cm long, equal, 1.5 cm diam., solid, dry, annulus absent, no indications of velar remnants, finely velutinate, pallid brown , base brownish-white (c 5D4). Flesh firm, dingy white, poss. discolouring dingy brownish-white with time. CONTEXT OF PILEUS: firm, dingy white, poss. discolouring brownish-white with time. SMELL: TASTE: gills and context not distinctive SPORE PRINT: pure white, Crawshay A when fresh. CHEMICAL REACTIONS: Formalin on context - deep, vinaceous slowly as in Phenol reaction. Phenol on context - deep red, vinaceous slowly FeSO4 on context - rapidly dull greyish-green. KOH on pileus - darkening? KOH on context - faint yellowing. NH4OH on pileus and context - no reactions. HABITAT : solitary under Leptospermum ericoides. Henderson Valley, Sharp's Bush, 6/4/67 , Coll. R.F.R. McNabb. Cuticle composed of a deep layer of repent obliquely ascending to erect hyphae, densely compacted and interwoven, with brown contents in KOH. Terminal cells unspecialised, not forming a palisade, not inflated, apices acuminate, rounded, sometimes slightly strangulated. Hyphae septate, thin-walled, smooth, 2.5-6.5um diam., of +- equal diam. Note: In none of the sections is there any indication of velar remnants on the cap cuticle. Context definitely heteromerous, composed of nests or lines of sphaerocsysts and connective filaments. Septate hyphae. Hymenophoral trama extremely distinctive, consisting of a cellular mediostratum of large +- isodiametric cells, and an abruptly defined subhymenium of filamentous, septate hyphae rather loosley arranged and not in the least compacted or cellular. Spores subglobose, apiculus slightly oblique, to 2um long, 9.1-11.7 x 7.8- 10.4um. Ornamentation to 1um high. Consisting of an almost complete reticulum of ridges, to an incomplete reticulum where not all adjacent verrucae are joined. Pearson type P2, P7, P9. Cheilocystidia not seen. A few sterile basidiomorphous bodies present on gill edge, also some short pleurocystidia near the edge with no well differentiated structures. Pleurocystidia numerous, scattered, not projecting beyond basidia, originating from deep within sub-hymenium, not from lactifers. Contents refractive in KOH, apically contracted, fusiform, xx with mucronate apices, thin-walled, hyaline 55-100 x 6.5-11um. basidia clavate, hyaline, 4-spored, sterigmata to 7.2um long 48-61 x 10.4-13um. Hymenium composed of basidia, pleurocystidia and hyaline thin-walled, cylindrical to subclavate paraphyses. Covering of stipe a somewhat disorganised palisade of thin-walled, hyaline, sepate hairs, projecting to 125um +- at right angles or obliquely, often aggregated into tufts, sometimes with brown contents, usually tapering apically. Acuminate or rounded apically, sometimes strangulated, branched basally or simple, septate tapering to 1.5um apically. Arising from a layer of interwoven (rather loosely) hyphae, c 5um diam., but often more inflated. [Ridley:] Basidiospores 8.25-9.5 x 8-9.25 um, [8.5-10.5 x 7.5-9.5 um] Qm 1.03, globose, Q= 1-1.15, globose to subglobose, hyaline. Ornamented with moderately crowded, obtuse, amyloid verrucae to 1 um high, occasionally isolated, usually in small confluent groups joined by low, moderately fine to coarse, amyloid ridges, forming an almost complete reticulum. Suprahilar plage a distinct inamyloid, smooth, c. 2.75 um wide. Hilar appendix obconical, oblique, to 15(-2) um. The observations agree with the original description. Ornamentation was type IIB, approaching type IIIA. [Cooper:] Cap is not infundibuliform (even tho image shows a cap that is), and is not inrolled. Only 1 fruitbody in holotype. With spore print. Cap close-up identical to pseudareolata. SV -ve, identical to pseudareolata. Cap section shows more trichodermal elements than pseudoareolata. Cap squash shown no difference to pseudareolata, except maybe more thin elongate acuminate elements. Gill cystidia much more prolific in this than pseudareolata. The spores have a lower reticulation and are perhaps broader than long, ie.e principle axis at right angles to hilum. Plage not seen, amyloid spot not seen. length=7.9–9.6µm (µ=8.6, σ=0.4), width=7.3–8.4µm (µ=7.7, σ=0.3), Q=1.0–1.3µm (µ=1.12, σ=0.05), n=20. Ornamentation to 1.2um. McNabb separates on basis that this does have the finer hairs and lower spore ornamentation - both could be variable characters. Amongst the paratypes of this and pseudoareolata most rimosa are incurved (except this one) and most have an areolate centre, pseudoareolata has paratypes with a mixture of these two characters. McNabb's observation of sphaerocysts in the gill trama is confirmed, and type of pseudoareolata does not have them, however other collections in the two groups both have them.