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The following material is based on (Ridley 1991) and original research of R. E. Tulloss.
80± mm wide, white or white with slightly smoky white over disc to sordid white, smooth; context not described; margin striate-sulcate (0.5R); universal veil absent.
adnexed to free, white, up to 7 mm broad, not forking, with edges slightly darker and flocculose; lamellulae truncate to rounded truncate to subtruncate, in three uneven ranks.
120± × 12.5± mm, white near apex, slightly grayish brown near base, shaggy with appressed lacerated areas; contents not described; exannulate; universal veil as saccate volva, white to dirty white, membranous, at least sometimes bilobate, up to 50± mm high.
120 - 145 (-170) µm thick, gelatinizing only just at the surface, colorless for a few hyphal diameters at surface, otherwise orangish to brownish yellow; filamentous undifferentiated hyphae 2.5 - 6.4 µm wide, branching, criss-crossed over disc, dominantly subradially oriented at mid-radius; vascular hyphae 2.4 - 17.8 µm wide, infrequently branching, unevenly distributed, locally common, sinuate, with irregular outline, with those of larger diameter deeply pigmented brownish orange to red-brown, with those of smaller diameter sordid yellowish to brownish yellow.
filamentous undifferentiated hyphae 2,9 - 9.5 µm wide, branching, forming an open lattice structure, sometimes constricted at septa, sometimes with slightly inflated intercalary segment, plentiful; acrophysalides plentiful, thin-walled and easily broken by sectioning, elongate-ovoid to subpyriform to broadly clavate to clavate to narrowly clavate to subfusiform, up to 170 × 55± µm; vascular hyphae 3.8 - 17.8 µm wide, occasionally branching, rather common, with those of larger diameter orange-brown and those of smaller diameter sordid brownish yellow, sinuous, occasionally with tight coils, occasionally crossing into pileipellis.
bilateral, divergent; central stratum and adjacent subhymenial base collapsed or poorly rehydrating in material examined, with central stratum apparently entirely composed of filamentous undifferentiated hyphae; subhymenial base contains branching hyphae and narrow subfusiform to elongate curved intercalary cells (e.g., 26 × 8.0 µm) or slightly inflated intercalary hyphal segments, with the inflated or partially inflated elements giving rise to subhymenium; filamentous, undifferentiated hyphae 2.0 - 6.5 µm wide, branching, apparently dominant in central stratum; divergent, terminal inflated cells not observed; refractive hyphae present, but possibly part of hyphomycete invading from lamella edge; vascular hyphae not observed with certainty.
as shallow branching structure containing small subglobose to ellipsoid to heart- or “Y”-shaped inflated cells and branched or irregular partially inflated cells and uninflated hyphal segments; with basidia arising from inflated and partially inflated cells and with some basidioles arising from uninflated hyphal segments, with bases of longer basidia only one or two cells separated from subhymenial base.
40 - 59 (-76) × 11.5 - 16.0 (-17.2) µm, about evenly distributed between 4-, 2-, and 1-sterigmate in some specimens, dominantly 4- and infrequently 1- or 2- or 3-sterigmate in others, with sterigmata up to 8.9 × 3.8 µm; clamps not observed.
On pileus: absent or as scattered partially gelatinized hyphal fragments and collapsed inflated cells from inner surface of volval limb. On stipe base, exterior surface: lattice with large gaps comprising interwoven filamentous, undifferentiated hyphae 1. 8 - 7.6 µm wide, branching, singly and in broad fascicles, partially gelatinized. On stipe base, interior: filamentous, undifferentiated hyphae 2.2 - 12.7 µm wide, frequently branching, dominating in most regions, singly and in fascicles interwoven in open lattice structure, occasionally with yellowish subrefractive walls; inflated cells thin-walled, terminal singly, rather common to plentiful, sometimes clustered, subglobose to ovoid to broadly ellipsoid to broadly clavate, up to 121± × 74 µm; vascular hyphae 2.3 - 8.9 µm wide, rarely branching, infrequent, unevenly distributed, sordid yellowish to brownish yellow. On stipe base, inner surface: comprising very narrow filamentous, undifferentiated hyphae singly and in fascicles, partially gelatinized or not gelatinized distributed in large patches (1 - 2 hyphal diameters thick) distributed over upper part of limb (formerly in contact with pileus) and, otherwise, simply comprising exposed tissue of interior.
[78/4/3] (9.5-) 11.3 - 13.9 (-22) × (8.6-) 10.0 - 13.0 (-17.5) μm, (L = 12.0 - 13.1 μm; L’ = 12.4 μm; W = 11.0 - 11.8 μm; W’ = 11.3 μm; Q = (1.04-) 1.05 - 1.16 (-1.37); Q = 1.09 - 1.11; Q’ = 1.10) hyaline, colorless, smooth, thin-walled, inamyloid, subglobose, infrequently globoe or broadly ellipsoid, at least somewhat adaxially flattened, occasionally (especially when incompletely mature) langeniform to clavate-langeniform to sublachrimiform; apiculus sublateral, cylindric, often proportionately elongated; contents dominantly monoguttulate, with or without additional small particles; color in deposit unknown.
Solitary to subgregarious. Under Nothofagus truncata or under N. menziesii. A “white individual” paratype of A. pekeoides not reviewed by RET was collected under Kunzea ericoides [Taylor 819 (PDD)].
NEW ZEALAND: NORTH ISLAND—Wellington Region - Rimutaka For. Pk., Orongorongo Track, 1.iv.1987 G. S. Ridley 362 (paratype of A. pekeoides, PDD 56145); Rimutaka For. Pk., Orongorongo Valley, Paua Ridge, 8.iv.1987 G. S. Ridley 394 (paratype of A. pekeoides, PDD 56147). SOUTH ISLAND—Nelson Region - Karamea, Umere, 4.i.1970 R. F. R. McNabb s.n. (paratype of A. pekeoides, PDD 31209).
The “white individuals” differ from A. pekeoides in at least the following:
shallow structure of the subhymenium with common partially inflated to inflated branching cells
color of pileus
relative length of the marginal striations of the pileus
presence of relatively common, deeply pigmented vascular hyphae in the pileipellis
size of the inflated cells in the universal veil (much larger in the present entity)
dominance of non-4-sterigmate basidia.
A sporograph comparison between the present entity and A. pekeoides is provided in the following figure:
Because of these significant differences, I propose that the “white individuals” represent a distinct species within the original concept of A. pekeoides. Of the three specimens examined, the McNabb collection is best documented with regard to its fresh state; and, for the most part, the fruiting body is well-preserved. Unfortunately, the exception is the poor preservation of the key tissue of the lamella trama. Therefore, I will not propose a name at this time in hopes that a more suitable collection will be available to serve as the type in the future.
—R. E. Tulloss
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Spore data for collections provisionally identified as: Amanita sp-Ridley-pekeoides-white
Each spore data set is intended to comprise a set of measurements from a single specimen made by a single observer;
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a single collection inadvertently contains a mixture of taxa.