Public Note:
[RHP] Fruit bodies up to 30 x 1.5 mm, simple clubs, scattered to gregarious but not cespitose, narrowly fusiform to cylindrical, arising from small white mycelial patches. Club pale yellow at maturity, paler when young, subopaque, equal; apex rounded. Stipe concolourous to paler, subtranslucent, equal. On soil and humus. Tramal hyphae hardly inflated, clampless, tightly packed, parallel; secondary septa common. Subhymenium poorly developed. Hymenium hardly thickening, free; basidia 40-50 urn long, clavate, attenuate below, clamped; contents minutely multiguttulate at maturity; sterigmata 4, spindly, divergent. Spores 5.8-7.9 x 4.0-5.0 um (L = 1.29-1.58; E= 1.45; Lm = 6.75 um), short cylindrical to ellipsoid, spiny at maturity, thin-walled; contents uniguttulate at maturity, the guttule highly refringent; hilar appendix small, not prominent; ornamentation of sharp, conical spines up to 2 um long, sparsely scattered over spore surface. COMMENTARY: Taxa in subgenus Holocoryne with ellipsoid spiny spores are few. One, Clavaria echinoolivacea, produces white fruit bodies and larger spores. The others, C. tuberculospora and C californica, produce yellowish fruit bodies, but in the former, spores are different in shape (but see under that name for caveats), and those of C. californica are significantly larger. Moreover, the hymenium in C. tuberculospora is agglutinated in dried specimens, making the basidial clamp difficult to observe, whereas that of C. echinobrevispora is free. Collections: 1) North Island: WKR, vie. Forestry Headquarters, 21.vi.81, coll. RHP, no. 42483 (holotype, PDD46669; isotype, TENN).
[JAC] not subsequently collected. Tissue squashes easily, as Petersen notes, unlike all other holocoryne exaimed so far. Basal loop easy to see. Spores length=6.3-8.3µm (µ=6.9, σ=0.40), width=4.2-5.2µm (µ=4.7, σ=0.28), Q=1.3-1.7µm (µ=1.48, σ=0.11), n=23.
J.A. Cooper, Nov. 2017