Polyporales » Gelatoporiaceae


Obba Miettinen & Rajchenb. 2012, in Miettinen& Rajchenberg, Mycological Progress, 11, 131-147 (2012).

Etymology: Obba (Lat.), a type of household container for liquids used in Rome; refers to the broad bottle-shaped cystidioles characteristic of the genus.

Description: Basidiocarp resupinate, annual to biennial, white when fresh, cream to ochraceous when dry, a few millimetres up to 13 cm long, up to 3 mm thick. Consistency soft when fresh, drying hard to brittle. Subiculum thin, cartilaginous line when dry. Hyphal system monomitic, clamps present, CB, IKI, CRB+. Hyphae mostly thin-walled to slightly thick-walled, mostly 23 μm in diameter. Coarse crystal rosettes in trama and tube mouths, (2)47(9) μm in diameter, also rhomboidal plates. Subicular hyphae often agglutinated. Tramal hyphae interwoven to subparallel, tissue rather dense, upper trama may be agglutinated. In KOH part of hyphal walls swell inwards and gelatinise, resulting in a capillary, distinct lumen. Free oil droplets present in microscopic slides. Cystidia none. Hymenium. Cells large (about 1520×69 μm), with oily contents. Basidia mostly clavate, with 4 sterigmata. Cystidioles subulate to mammiform, common. Basidiospores subglobose to globose, CB(+), plasma stained in CB, with a large hyaline oil droplet, thin- to slightly thick-walled, smooth.

Index Fungorum Number: IF519509

Type species: Obba valdiviana (Rajchenb.) Miettinen & Rajchenb. 2012, in Miettinen& Rajchenberg, Mycological Progress, 11, 131-147 (2012).


Obba rivulosa (Berk. & M.A. Curtis) Miettinen & Rajchenb. 2012

Obba thailandica G.J. Ren & F. Wu 2017

Obba valdiviana (Rajchenb.) Miettinen & Rajchenb. 2012



Miettinen, O., & Rajchenberg, M. (2012). Obba and Sebipora, new polypore genera related to Cinereomyces and Gelatoporia (Polyporales, Basidiomycota). Mycological Progress, 11, 131-147.


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)


  • Email: basidio.org@yahoo.com
  • Addresses:
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  • 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

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