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Asques inamyloïdes, 68,9-83,3 x 8,3-8,4um.

Spores ellipsoïdes, 12,0-13,6 x 4,6-5,2um.

Pore apical 2,9-3,7 x 1,9-2,3um.

Document consulté :

Réblová, Martina & Miller, Andrew & Réblová, K. & Štěpánek, Václav. (2017). Phylogenetic classification and generic delineation of Calyptosphaeria gen. nov., Lentomitella , Spadicoides and Torrentispora ( Sordariomycetes ). Studies in Mycology. 89. 10.1016/j.simyco.2017.11.004.

Information on this species can be found in Ascomycete Fungi of North America on the species description page for Dumontinia tuberosa, which has a similar macro- and micromorphology as S. rapulum. S. rapulum is distinguished by arising from “a black stroma on buried blackened rhizomes, corms, and bulbs of monocotyledons.” Stromatinia rapulum is apparently rare or rarely collected and only has one representative rDNA sequence on GenBank, from a specimen collected in Norway in the 1990s.

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Image #3: Biggutulate, ellipsoid ascospores.
Image #5: The spores are biguttulate and ellipsoid
Image #6: Excipular hyphae
Image #7: This is the juncture between the excipulum and the interior hyphae of the apothecium.
Image #10: (1000x magnification) Compare to the next image, showing the effects of adding Melzer’s reagent.
Image #11: The ring of the inoperculate asci is amyloid in Melzer’s reagent (1000x magnification). This photo is the same frame as the previous. Notice how the ascospores lose their guttules and the spores and asci shrink in size, indicating the importance of measuring fungal structures in the living state
Image #12: The ring of the inoperculate asci is amyloid in Melzer’s reagent (1000x magnification)
Image #24: The fruiting bodies were growing from the blackened rhizomes of Polygonatum sp. (Solomon’s seal)
Image #25: The fruiting bodies were growing from the blackened rhizomes of Polygonatum sp. (Solomon’s seal)
Image #27: Cross section of fruiting body at 20x magnification (dissection scope)

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Additional sequences:

ITS: GenBank MW464415

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Originally posted to Mushroom Observer on Apr. 27, 2019.

Growing on Racomitrium heterostichum on granitic boulder on edge of disused resource road.

(a) Showing habitat on boulder with necrotic patches of Racomitrium heterostichum. (2) Habit showing numerous rimmed apothecia. (3) Detail of habit showing appothecia emergent from stems of Racomitrium heterostichum. (d) Showin g closeup of apothecia. (e) Section of apothecia showing hymenium and single emergent ascus. (f) Ascus with 8 elongate ascospores. (g) Empty ascus. (h) Spores in detail, measuring ~ 20um x 3 um.

Biggest cup ever seen: 1 cm in diameter. Hairs are 1.5mm. On soil, among moss. Color is really a deep orange with some red in it. It has few pairs of setae inside a 'wing'/sheath. Rooting is narrow, from 1-2 'legs' on marginal setae; up to 4 on excipulum setae. Spores are all round.

This fungus infects Box elder (Acer negundo) and turns the twigs white, killing them. Sometimes the fungus looks like broken up black circles (see photo 1), a bit like cheetah spots, and sometimes it looks like complete circles. I have seen similar Box elder twigs with this fungus, where part of the pale twig was an orangish pink hue.

After letting the twig sit in a moisture chamber, pinkish goo started to ooze out of the black circles. I believe this is an anamorph of some Ascomycete. A photo of the conidia at 1000x is shown. The spores are elliptical / pill shaped and have numerous round guttules in them.

Previous observations:
https://www.inaturalist.org/observations/200536858
https://www.inaturalist.org/observations/196420044
https://www.inaturalist.org/observations/194669917
https://www.inaturalist.org/observations/157445322
https://www.inaturalist.org/observations/151691625
https://www.inaturalist.org/observations/151691465
https://www.inaturalist.org/observations/148312162
https://www.inaturalist.org/observations/144672964
https://www.inaturalist.org/observations/110823238
https://www.inaturalist.org/observations/110170481

Growing on Pinus rigidus needles that fell down in a swampy area. Pine Barrens. Biggest cup was 5mm in diameter, and very thin, like a flat lentil. Asci 98-123 x 7.4-9.8 um. Spores 11.1-14.8 x 4.9 um. Paraphyses show twisted, branched, curly and straight ends, around 2.4 um wide.

Growing on a curled Rhododendron catawbiense leaf. Ascocarps up to 0.7 mm wide; fringed with tufts of hairs; sessile. Ascocarps seated individually on small, white, membranous subicula. Not noticeably bioluminescent. Not noticeably fluorescent under UV light. Hair tufts composed of fascicles of smooth, hyaline hairs. Asci inoperculate and 8-spored with amyloid apical apparatuses. Spores hyaline, smooth and 3-septate. Spore measurements: (16) 17.1 – 20 (21.3) × (3) 3.2 – 3.8 (4.1) µm; Q = (4.4) 4.5 – 5.8 (6.2); N = 30; Me = 18.2 × 3.6 µm; Qe = 5.2

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Originally posted to Mushroom Observer on Aug. 22, 2023.

in the sand and gravel beside a road/ three at different stages/ this one: cap 7.1 cm wide, stem narrower at apex 1.3 cm to 1.5 cm at base/ gills have a pinkish hue/ spore print: cream/ when fresh no odour, while drying ti, quite a strong & unpleasant odour/ spores: ellipsoid and unigutulate/ 9.8 - 10.8 x 6.1 - 6.4 microns

Fire pit. Microscopy. Ascospores approx. 15.0-17.0 x 7.9-8.8. Q=1.9. Multi-septate rounded ended hairs, some longer than 100µm; paraphyses greenish in iodine - many forked. (FBs were bright yellow-orange, which my camera has trouble picking up, so I had to pump up saturation to make them closer to their actual colour.) Vouchered. JET230703_02

ID help appreciated.
iNat was very consistent in its top suggestion: Stalked Hairy Fairy Cup (Lachnum virgineum).
Totally love that name. I didn't see stalks, but they were so tiny who would know?
I backed up a couple of taxon levels as a starting place.