Observation 196887: Inonotus P. Karst.

Rather larger than normal specimen in good condition. Growing in loose and wet forest soil. Location Eucalyptus and Semi-rainforest area. Local rainfall exceeding 6 inches previous 24 hours. Raining during image shoot. Fungi firm to handle but loose in habitat.



Proposed Names

29% (1)
Recognized by sight
31% (2)
Recognized by sight: Pores on the bottom.
46% (2)
Recognized by sight
61% (2)
Eye3 Eyes3
Used references: Comments provided by Heino Lepp from dried specimen.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Comments courtesy Heino Lepp Inonotus australiensis (see last image)

Your specimen is quite light and fragile. The brown context blackens in KOH, I find only simply septate hyphae, 4-8 mu in diameter; no setae nor any setal hyphae; spores hyaline, smooth, sub-globose, 3.6-4.8 × 3.2-4.0 mu, some weakly dextrinoid. I think it best fits into Inonotus australiensis.

The original description of that species is on page 33 of Leif Ryvarden’s “The genus Inonotus: a synopsis” (=Synopsis Fungorum, volume 21, published by Fungiflora, Oslo in 2005). Some points from his macroscopic description: solitary to imbricate; substipitate with a lateral, tapering partly flatted stipe; pilei fan-shaped to semi-circular in outline; to 10 cm wide and individual pilei up to 1.5 cm thick; pileal surface rusty to ochraceous brown, azonate. Ryvarden notes that this species is “striking by the combination of a substipitate basidiocarp, a total lack of setal organs and subglobose dextrinoid spores”.

Thus far the species seems to be known only from eastern Australia. Ryvarden studied several collections, from Lamington National Park south to Victoria. I’ve collected it once, from the Stroud/Gloucester area of NSW. My collection consists one laterally stiped basidiocarp and what initially appears to be a roughly circular pileus atop a thick central stipe. A closer look makes me think that in the latter is composed of three, very well fused basidiocarps in which at least one stipe clearly shows evidence of having been lateral. All seemingly grew from soil, but perhaps there had been buried wood. I see that I’d noted that many (but not all) of the hyaline spores were weakly dextrinoid. Initially I had filed this as Coltricia sp., not too surprising given that some species have moved between Coltricia and Inonotus (and Onnia for those who maintain this as distinct from Inonotus). I reckon I might have to re-look at some of my Coltricias.

By the way, the stubby, rounded outgrowths from the top of the pileus look like very immature basidiocarps. The attached photo shows one, the white scale bar indicating about 5 mm. You can see a rusty brown stipe above which there are shallow white pores and the top is a little broadened. Perhaps, left in situ, that top would have broadened into a proper pileus and the pores lengthened into tubes – or the whole thing might just be some abnormal growth that would have come to nothing. I didn’t have my macro lens with me, so I had to do this with hand-held camera over the eye-piece of a dissecting microscope.



Cap with small
By: Daniel B. Wheeler (Tuberale)
2015-01-23 17:46:39 CST (-0500)

circular areas, and largish upraised lobes. Albatrellus, maybe?

Created: 2015-01-22 22:09:12 CST (-0500)
Last modified: 2015-07-01 00:57:00 CDT (-0400)
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