Auriculariales » Auriculariales genera incertae sedis » Stypellopsis

Stypellopsis hyperborea

Stypellopsis hyperborea Spirin & Malysheva 2018, in Spirin et al., Antonie van Leeuwenhoek, 112, 753-764 (2018).

Etymology: Hyperboreus (Lat., adj.)—northern

Diagnosis: Basidiocarps gelatinous, first appearing as conical or needle-like outgrowths 0.05–0.3 mm long, then fimbriate, partly fusing, semi translucent, whitish or with faint violaceous tints, later coalescent and producing reticulate compound basidiocarps 0.5–4 cm in diam. Hyphae clamped, thin-walled, 1–2.5 µm in diam., some brownish in KOH. Tramal cystidia tubular, tapering to somewhat moniliform or obtuse, some brownish in KOH, 60–210 9 9–17.5 µm (n = 32/3); hymenial cystidia (gloeocystidia) clavate to tapering, some pleural, irregularly arranged, 14–32 9 4–12 µm. Hyphidia occasionally branched, 0.5–2 µm in diam. Basidia (9.2–) 9.3–11.3 (–11.8) 9 (7.8–) 8.0–11.4 (–12.1) µm, sterigmata occasionally branched, 5–19 9 1.8–3 µm, enucleate stalk 7–30 9 2–3.5 µm. Basidiospores (4.8–) 5.1–7.0 (–7.1) × (4.0–) 4.1–5.9 (–6.2) µm (n = 200/7), L = 5.77–6.07, W = 4.89–5.21, Q = 1.14–1.19.

Index Fungorum Number: IF826895

Notes: Stypellopsis hyperborea possesses the largest basidiospores of the species complex. It seems to be a truly boreal species distributed in coniferous forests of North Europe.

 

 

Figure 1.  Basidiocarps of: a Stypellopsis hyperborea (holotype) (scale bar = 5 mm); b S. farlowii (Spirin 8254) (scale bar = 0.5 mm); c Mycostilla vermiformis (Spirin 11621) (scale bar = 0.5 mm)

 

Fig. 2 Microstructures of (1) Stypella papillata (lectotype): a –conidiophores (as observed in normal light and KOH mountant), b – conidia, c – cystidium, d – hyphae; (2) Stypellopsis farlowii: a – hymenial cells, hyphae and basidiospores (Spirin 10901), b –basidia, c – gloeocystidia and cystidia(Spirin 8254); (3) Mycostilla vermiformis (Spirin 11330): a – gloeocystidia, b – cystidia, c – basidia; (4) Stypellopsis hyperborea (holotype): a – basidia, b – gloeocystidia and cystidia. Scale bar = 10 lm.

 

Figure 3.  Phylogenetic relationships of lineages within the Auriculariales: a the best tree from the ML analysis of the nrLSU dataset. ML BS and Bayesian posterior probability (pp) values for internal nodes are given above the branches (BS/pp); b the best tree from the ML analyses of the nrITS dataset. Voucher numbers are given for newly sequenced specimens and accession numbers for additional sequences retrieved from GenBank. Scale bar shows expected changes per site.

 

Figure 4. Basidiospores: a Mycostilla vermiformis (Spirin 11330), b Stypellopsis farlowii (Spirin 8254), c S. hyperborea (holotype). Scale bar = 10 µm

 

Reference:

Spirin, V., Malysheva, V., Haelewaters, D., & Larsson, K. H. (2019). Studies in the Stypella vermiformis group (Auriculariales, Basidiomycota). Antonie van Leeuwenhoek, 112, 753-764.

 

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