2 fruiting bodies growing scattered. Both growing through a well-rotted Fagus grandifolia (?) log near Fagus grandifolia, Quercus sect, Lobatae and Acer saccharum. Quercus alba, Pinus echinata, Pinus rigida, Sassafras albidum, Oxydendron arboreum and Kalmia latifolia further away. Mature fruiting body (=FB) 4.0 cm tall. Immature FB 3.1 cm tall. Pileus dry; 2.2 cm wide in mature FB; 0.9 cm wide in immature FB; with whitish bloom toward center in immature FB; with small umbo in both FBs. Lamellae light yellowish-brown; sinuate; ~0.9 cm long at longest. ~36 full length lamellae present on mature FB (calculated by counting number in rough 1/4 and multiplying that number by 4). Lamellulae 3-tiered based on examination of photos. Stipe 0.4 cm wide at apex of mature FB; 0.3 cm wide at apex of immature FB; 0.7 cm wide at base of mature FB; 0.6 cm widest base of immature FB. Did not notice cortinas but there were small brown fibrils over the upper halves of the stems that were likely cortina remnants. Cheilocystidia absent. Basidia 4-sterigmate. Spores brown, thick-walled and roughened. Spore measurements: (8) 9.3 – 11.3 (11.7) × (4.4) 4.8 – 5.8 (6.1) µm, Q = (1.7) 1.9 – 2.1 (2.2); N = 30, Me = 10.2 × 5.2 µm; Qe = 2

Species Lists


DSC_1533 Gill edge with basidia and spores at 400x in NH4OH (2 drops), congo red (1 red) and phloxine (1 drop).JPG
DSC_1536 Basidia and spores at 400x in NH4OH (2 drops), congo red (1 red) and phloxine (1 drop).JPG
DSC_1568 Spores at 400x in NH4OH (2 drops), congo red (1 red) and phloxine (1 drop).JPG

Proposed Names

26% (2)
Recognized by sight
61% (2)
Recognized by sight: BLAST results, no particularly close matches there or in the literature
Used references: Kauffman, C. H. (1918). The Agaricaceae of Michigan, Mich. Geol. and Biol. Surv. Publ, 26, 773-774.
Pomerleau, R. (1980). Flore des champignons au Québec et régions limitrophes. [Montréal]: Éditions La Presse.
Miller Jr, O. K., & Miller, H. (2006). North American mushrooms—a field guide to edible and inedible fungi. Guilford, Connecticut: Falcon Guide.
Courtecuisse, R., & Duhem, B. (1995). Mushrooms and Toadstools of Britain and Europe. Collins Field Guide. R. Courtecuisee, B. Duhem.–London: Harper Collins.
Ballarà i Noguera, J. (1996) Estudis sobre Cortinarius subalpins de Catalunya: 1. Espècies recol· lectades a l’Hylocomio-Pinetum catalaunicae. Revista Catalana de Micologia, 47-66.
Ammirati, J. F., & Smith, A. H. (1969). Studies in the genus Cortinarius. I. Section Dermocybe, Cortinarius aureifolius complex. Michigan botanist 8: 175-180.
Smith, A. H. (1939). Studies in the genus Cortinarius I. Contributions from the University of Michigan Herbarium 2. 43 pp.
Kühner, R. (1961). Notes descriptives sur les Agarics de France. I.-Cortinarius (suite). Telamonia et Hydrocybe. Publications de la Société Linnéenne de Lyon, 30(3), 50-65.
Smith, A. H. (1942). New and unusual Cortinarii from Michigan, with a key to the North American species of subgenus Bulbopodium. Bulletin of the Torrey Botanical Club 69: 44-64.
Hansen, L. & Knudsen, H., eds. (1992). Nordic macromycetes Vol. 2: Polyporales, Boletales, Agaricales, Russulales. Copenhagen: Nordsvamp. 474 pp.
Peck, C. H. (1910). Report of the state botanist 1909. New York State Mus. Bull. 139: 1-114
Peck, C.H. (1887). Descriptions of new species of New York fungi. Bulletin of the New York State Museum. 1(2):5-24
Based on microscopic features
27% (1)
Used references: Bold-Repertoire Cortinarius

Please login to propose your own names and vote on existing names.

= Observer’s choice
= Current consensus


Add Comment
Probably not C. sp. IUMQ3989
By: Garrett Taylor (cappy)
2021-02-02 16:27:59 PST (-0800)

but very, very close. Bold has an exact match but it is private. C sect. Megaspori Kytöv., Niskanen & Liimat is where they have that one. It’s not on here and I have been spamming this site a lot tonight already.

Cortinarius “sp-IN45”
By: Stephen Russell (Mycota)
2020-05-10 11:59:40 PDT (-0700)

in my database.

Also apparently present in the Colombian Andes!
By: Django Grootmyers (Heelsplitter)
2020-05-03 18:41:44 PDT (-0700)
Same as here:
By: Stephen Russell (Mycota)
2019-12-29 20:36:34 PST (-0800)
Also present in North Carolina and Michigan based on BLAST hits
By: Django Grootmyers (Heelsplitter)
2019-11-17 21:20:08 PST (-0800)