Notes:
Growing in rich black soil and leaf litter in a seasonally flooded forest near Quercus sect. Quercus, Fagus grandifolia, Carya spp. and Acer saccharum. All structures inamyloid. Releasing abundant oil drops in Melzer’s reagent. Dimitic with clamped generative hyphae. Pileus smooth and zonate. Brown cystidioles absent. Metuloid cystidia absent. Gloeocystidia present and projecting slightly. Basidia 4-sterigmate. Spores smooth. Spore measurements: (5.3) 5.5 – 6.8 (7.3) × (3.6) 4 – 4.8 (5.3) µm, Q = (1.2) 1.3 – 1.57 (1.6) ; N = 30, Me = 6.2 × 4.4 µm ; Qe = 1.4

Species Lists

Images

WP_20160918_18_44_22_Pro__highrescrop.jpg
WP_20160918_18_44_11_Pro__highres.jpg
gloeocystidium.jpg
Gloeocystidium in 5% KOH and phloxine at 1000x
clamp connection.jpg
Clamp connection in 5% KOH and phloxine at 1000x
gloeocystidia.jpg
Gloeocystidia in 5% KOH and phloxine at 1000x
DSC_3757 100x in Melzer's.JPG
DSC_3758 Skeletal hyphae at 400x in Melzer's.JPG
DSC_3791 Spores and oil drops at 400x in Melzer's.JPG
DSC_3797 Gloeocystidia, spores and other structures at 400x in Melzer's.JPG
DSC_3800 Gloeocystidia and other structures at 400x in Melzer's.JPG
DSC_3819 Gloeocystidia, spores and other structures at 400x in NH4OH (2 drops), phloxine (1 drop) and congo red (1 dr...
DSC_3823 Basidia and gloeocystidia at 400x in NH4OH (2 drops), phloxine (1 drop) and congo red (1 drop).JPG
DSC_3826 Basidia and other structures at 400x in NH4OH (2 drops), phloxine (1 drop) and congo red (1 drop).JPG
DSC_3834 100x in NH4OH (2 drops), phloxine (1 drop) and congo red (1 drop).JPG

Proposed Names

-5% (2)
Used references: A monograph of the stipitate stereoid fungi, Stereum s.l. (Welden), The Thelephoraceae of North America. XII. Stereum (Burt)
Based on microscopic features: No brown cystidioles, gloeocystidia present
57% (1)
Used references: Ryvarden, L. (2010). Stereoid fungi of America. Fungiflora.
Welden, A. L. (2010). Stereum sl. Flora Neotropica, 1-80.
Mouchacca, J., & Dennetière, B. (2013). P. Hennings (1898) Fungi centro-africani: species collected by G. Schweinfurth in what is now the Republic of South Sudan: A revisit. MYCOSPHERE, 4(3), 496-518.
Based on microscopic features

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= Observer’s choice
= Current consensus

Comments

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Hi Danny
By: Django Grootmyers (Heelsplitter)
2019-06-06 11:10:28 CDT (-0500)

Stephen sent the collection back to me after sequencing to be sent on to my preferred herbarium. I was able to do more microscopy using a better camera and with more experience under my belt. I also got Ryvarden’s new book on stereoids, which was very helpful. I keyed it out there and it was a very good match for P. thozetii. The spores and cystidia were different from P. ravenelii IIRC. Both species have been reported from the Southeast.

Glad to see —
By: Danny Newman (myxomop)
2019-06-06 06:30:08 CDT (-0500)

And sorry I missed until now — this high quality workup of an oft neglected and seldom collected group. Could you talk more about why it’s definitely one of these I’d options you proposed and not the other, and how you ruled out everything else? Are there NA records of either of these spp.? And yes, I’m on a phone and therefore too lazy to check the MycoPortal myself ;) forgive me.

Created: 2016-11-08 03:27:58 CST (-0600)
Last modified: 2019-06-06 11:10:28 CDT (-0500)
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