1-prl11808 2-prl11527

Gloeoporus dichrous (Fr. : Fr.) Bres.

Hedwigia 53: 506 (1912)

gelatinous-pored polypore; bicoloured bracket
Annual, effused-reflexed. Upper side and margin white. Lower side reddish brown, salmon-colored, with small shallow pores. When fresh, the gelatinous to rubbery pore layer can be stretched and separated from the white underside of the cap tissue. Microscopic characters: hyphae with clamps; cystidia absent; spores allantoid (curved like a sausage) to cylindrical.
Similar species:
Gloeoporus taxicola grows on conifers and is effused with a white margin but no projecting cap; hyphae lack clamps, hymenium has pointed cystidioles (sterile cells similar in size to basidia).
White rot on hardwoods, rarely conifers. Reported to be found on dead polypores.
For Chicago Region can be found from May to November.
Widespread across North America.
Chicago Region status:
Fairly common. Widespread.
Ginns (2014, PDF) gives no explanation for his new combination in Gelatoporia. DNA phylogenies argue against this placement.

Gloeoporus has a continuous hymenial layer over the pores, a feature shared with some other phlebioid taxa, unlike Gelatoporia subvermispora that has differentiated dissepiment edges (tube mouths). This feature is part of the reason Niemelä (1985) could not place Ge. subvermispora in Gloeoporus (Niemelä 1985 genus description, species description). There is a separate paper [need to find again] that explains why the name Gelatoporia should be used in a restricted sense and would not apply to our Gloeoporus dichrous, in part because the hymenium development is different.

The phylogeneitc work of Binder et al. 2013 and earlier papers shows Gelatoporia subvermispora (type species of that genus) to be outside the phlebioid clade far removed from Gl. taxicola and Gl. dichrous. However Gl. dichrous is not apparently directly related to Gl. taxicola but instead next to Gloeoporus pannocinctus (another taxon that cannot be kept in Gelatoporia). This was pointed out in Rajchenberg 2011, p. 696. Further work is needed to sort out relationships. The type species for Gloeoporus, Gl. thelephoroides needs to be included in DNA phylogenies to see its placement. Gloeoporus dichrous may need a new genus name but it is not Gelatoporia.

Specimens examined:
Our research database has 50 collections plus 25 observations for the past 20 years.
Description links:
Michael Kuo ; Gary Emberger ; Gilbertson European Polypores
Records online:
Mushroom Observer ; MycoPortal
Taxon links:
228918 MycoBank ; Index Fungorum ; Species Fungorum