Subulicystidium tedersooi Ordynets, Scherf & Langer

Ordynets, Alexander, Scherf, David, Pansegrau, Felix, Denecke, Jonathan, Lysenko, Ludmila, Larsson, Karl-Henrik & Langer, Ewald, 2018, Short-spored Subulicystidium (Trechisporales, Basidiomycota): high morphological diversity and only partly clear species boundaries, MycoKeys 35, pp. 41-99: 41

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Subulicystidium tedersooi Ordynets, Scherf & Langer

sp. nov.

Subulicystidium tedersooi Ordynets, Scherf & Langer   sp. nov. Figs 4g, h View Figure 4 ; 10f View Figure 10


Species with particularly narrow fusiform basidiospores, 8.5-11.5 × 2-2.5 µm and long, 85-125 µm, regularly encrusted cystidia.


VIETNAM. Ninh Bình Province: Cuc Phuong National Park , sampling area G2906, 20.3500, 105.6026, on fallen decayed twig, 15 Oct 2012, L.Tedersoo ( TU 110894 View Materials ) GoogleMaps   .


tedersooi, named after Leho Tedersoo, an Estonian mycologist, the vigorous explorer of the global soil fungal diversity and collector of the type specimen.


Basidiomata   annual, effused, resupinate, soft and fragile, arachnoid, thin, loosely adnate. Hymenophore smooth, finely velutinous due to numerous protruding cystidia, whitish. Margin thinning out, adnate.

system monomitic. All septa with clamps. Subicular and subhymenial layer weakly differentiated, consisting of richly branched hyphae 2-3 µm wide, thin-walled, with rough surface due to a subinvisible hyaline crystal sheath. Cystidia   subulate, 85-125 × 4.5-5 µm, usually without basal swelling, terminal, with thick hyaline cell wall and an outer hyaline crystal sheath covering the whole cystidium except the acuminate apex. Crystal protrusions on cystidium are rectangular, moderately large, regularly arranged in longitudinal rows.

Basidia suburniform to cylindrical, 9-13 × 4.5-5, thin-walled, with 4 sterigmata and a basal clamp, occasionally with a thin hyaline crystal collar at the base. Basidiospores narrowly fusiform, L=(7.9-)8.4-11.5(-11.8) µm, W=(1.9-)2.1-2.6(-2.8) µm, Q=(3.4-)3.5-5.0(-5.7), N=81/2, with straight to slightly curved base, thin-walled, often with two large or many smaller oil drops, negative in Melzer’s reagent.

Additional specimens examined.

VIETNAM. Ninh Bình Province: Cuc Phuong National Park , sampling area G2906, 20.3500, 105.6026, on fallen decayed twig, 15 Oct 2012, L.Tedersoo ( TU 110895 View Materials ) GoogleMaps   .

Remarks on species.

The narrow spores of S. tedersooi   are comparable in width only with S. perlongisporum   (see Fig. 10f View Figure 10 vs. 10j). However, the spore length of two species drastically differs: 8.4-11.5 µm in S. tedersooi   vs. 17-25 µm in S. perlongisporum   ( Boidin and Gilles 1988). S. tedersooi   also has shorter basidiospores and longer cystidia than its sister species S. fusisporum   (see Figs 4 View Figure 4 , 10 View Figure 10 and 11 View Figure 11 for spore and cystidia comparisons and Figs 12 View Figure 12 - 14 View Figure 14 for phylogenetic inference).