Subulicystidium rarocrystallinum Ordynets & K.H.Larss., 2018

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

Subulicystidium rarocrystallinum Ordynets & K.H.Larss. sp. nov. Figs 6f-h ; 10k

Diagnosis.

Differs from all other Subulicystidium species by cystidia which bear few spaced and irregularly located crystals and have a thick cell wall.

Type.

COLOMBIA. Cundinamarcha : 23rd kilometre of a highway from Medellin (direction SE) to Tenjo, alt 2600 m, 6.0605, -75.4095, on dead twig, 4 Jun 1978, L.Ryvarden (LR 15483 in O:F 918488) .

Etymology.

rarocrystallinum (Lat.), having few spaced crystals on cystidium.

Description.

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

system monomitic. All septa with clamps. Subiculum thin, compact, with richly branched hyphae 3-3.5 µm wide, thin-walled to slightly thick-walled, hyaline and smooth. Subhymenium thin, compact, with richly branched hyphae 3-3.5 µm wide, thin-walled, smooth. Cystidia subulate, 45-65(-80) × 3.7-5 µm including encrustation, projecting up to 50 µm, with especially thick-walled, occasionally slightly swollen (up to 5.5 µm), basal part, with outer hyaline crystalline sheath covering the whole cystidium except the tapering, thin-walled apex. Crystal protrusions on cystidium are moderately large, rectangular to rounded, rather sparse and allocated rather irregularly and mostly in the medial part.

Basidia suburniform, 11-15 × 4.5-5.5 µm, thin-walled, with 4 sterigmata and a basal clamp, without encrustation. Basidiospores cylindric, adaxial side slightly concave, L=(7.5-)8.0-10.5(-10.8) µm, W=(2.8)2.9-3.7(-3.8) µm, Q=(2.2-)2.5-3.2(-3.7), N=72/1, with minute apiculus, smooth, thin-walled, hyaline, negative in Melzer’s reagent.

Remarks on species.

The few spaced far from each other crystals on cystidium and thick cell wall of cystidium are peculiar. Furthermore, in the single collection studied, cystidia were relatively infrequent and subhymenium was more compact than in other species. Species can be distinguished from Subulicystidium brachysporum also by larger cylindric basidiospores.

Figures

Figure 6. Species of Subulicystidium with long cylindric basidiospores. Subulicystidium grandisporum (LR 29162 in O: F 506781): a hymenium with rich crystalline encrustation b cystidia c basidiospores. Subulicystidium obtusisporum (FR: W 213 - 3 - I): d cystidia e basidiospores. Subulicystidium rarocrystallinum (LR 15483 in O: F 918488, holotype): f cystidia g hymenium h basidiospores. All preparations done in 3 % aqueous solution of potassium hydroxide (KOH) mixed with 1 % aqueous solution of Phloxine. All scale bars equal 10 µm.

Figure 10. Basidiospore shape and size in all studied species of Subulicystidium. Each species is illustrated by a single specimen and herbarium codes are indicated on the figure.