Agaricales » incertae sedis » Dendrogloeon

Dendrogloeon helenae

Dendrogloeon helenae Spirin, Ryvarden & Miettinen. , in Spirin et al., Synopsis Fungorum (Oslo) 33: 26 (2015)

Basidiocarps resupinate, grayish white, tough ceraceous, 0.030.05 mm thick, margin indistinct. Hymenial surface smooth, margin not differentiated. Hyphal structure monomitic, hyphae clamped. Subicular hyphae very densely arranged and partly glued together, slightly thick-walled, faintly cyanophilous, 34 μm in diam. Basidiospores broadly ellipsoid to subglobose, thin-walled, (8.1–) 8.310.3 (–10.4) × (6.2–) 6.58.3 (–9.2) μm, L = 9.23, W = 7.53, Q’ = (1.1–) 1.21.4 (–1.5), Q = 1.23 (n = 20/1), with large central oil  drop, inamyloid, acyanophilous. Basidia obovate, four-celled, (18.3–) 18.426.2 (–26.9) × (9.7–) 9.812.7 (–13.0) μm, slightly thick-walled (wall 0.30.5 μm thick), guttulate, with rather thick and straight, mostly blunt sterigmata up to 11 × 5 μm. Tramal / subhymenial hyphae densely arranged, thin-walled, 23 μm in diam. Gloeocystidia abundant, narrowly clavate, 2228 × 58 μm (n = 10/1), with brownish, strongly cyanophilous content. Dendrohyphidia abundant, richly dichotomously branched, 12.5 μm in diam., embedded or slightly projecting, in some parts apically encrusted by rosette-like or stellate crystals.

Notes:

D. helenae is so far known only from the type locality. Both nLSU and ITS sequences of the species give no close matches in GenBank. D. helenae is undoubtedly a member of the Auriculariales but it is very distant from other genera possessing similar morphological characters. The presence of gloeocystidia and almost subglobose spores brings Basidiodendron to mind, but species of the latter genus have thin-walled, shorter, broadly urniform or subglobose basidia, which collapse and form involucre-like structures in older basidiocarps (Luck-Allen 1963, Wells & Raitviir 1975). The sole representative of Bourdotia, B. galzinii, has stalked (petiolate) basidia and a well-developed epihymeniallayer consisting of densely arranged hyphidia (Wells & Raitviir 1975, Weiss & Oberwinkler 2001). No gloeocystidiate species are known in Exidiopsis; however, the latter genus is highly artificial in morphological terms and certainly polyphyletic.

Figure 1. Dendrogloeon helenae (from the holotype): hymenial cells and basidiospores. Scale bar = 10 μm.

References:

Spirin V, Ryvarden L, Miettinen O. 2015. Notes on heterobasidiomycetes from St. Helena. Synopsis Fungorum. 2531.

 

About Basidiomycota

The webpage Basidiomycota provides an up-to-date classification and account of all genera of the phylum Basidiomycota.

 

Supported by 

Thailand Science Research and Innovation (TSRI)

project entitled:

"Macrofungi diversity research from the Lancang-Mekong Watershed and surrounding areas"

(Grant No. DBG6280009)

Contact

  • Email: basidio.org@yahoo.com
  • Addresses:
    Mushroom Research Foundation, 292 Moo 18, Bandu District,
    Muang Chiangrai 57100, Thailand
  • The State Key Lab of Mycology, Institute of Microbiology, Chinese Academy of Sciences, No.3 1st Beichen West Rd., Chaoyang District, Beijing 100101, P.R. China


Published by the State Key Lab of Mycology, Institute of Microbiology, Chinese Academy of Sciences and
Mushroom Research Foundation
Copyright © The copyright belongs to the Curators. All Rights Reserved.