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Taxon: Mytilinidion gemmigenum Fuckel
Family: Mytilinidiaceae

Collector: Mahoney, Dan   s.n..   

Date: 2013-08-05

Locality: United States, Minnesota, Lake, Ely, Behind U.S. Forest Service summer lease lot #4, Snowbank Lake, 22 miles NE of Ely

47.97  -91.4

Substrate: Old dead decaying decorticated branch of Pinus (probably white or jack pine);

Notes: Ascomata black, conchate (hinge end attached to the wood – elongate crest along the uppermost edge, superficial, solitary to gregarious, fragile with the peridium breaking easily. Side view with the upper edge flat but with slight bulges at either end and the sides curving downwards to a narrower (but still broad) attachment. The ostiole a long slit along the uppermost edge and this sometimes slightly open. Long sunken striations, parallel to the ostiole, ornament each opposing peridial side of the ‘mussel-shaped’ ascoma. Pseudoparaphyses present - though not abundant, hyaline, narrow, branched and anastomosing. Asci numerous, cylindrical with 8 biseriately-arranged overlapping ascospores filling the ascus, the stipe very short, stout and slightly bifurcate, the apex not bluing in Melzer’s, rounded with a faint narrow central ‘canal’ at the very apex, 125–155(–175) X 8–9(–10) µm (n=17). Ascospores light brown to light yellow-brown, smooth, asymmetrical (broadest about 1/3 back from the distal end and tapering gradually from that area to the rounded distal end and the narrower rounded basal end, usually with 5 transverse septa but 3, 4 or 6 septa sometimes seen, not invaginated at the septa, younger spores with one to several uniseriately-arranged guttules in each cell (these not seen in more mature spores), 32.5–42.5(–50) X 4–5.5 µm – many free spores with collapsed cells in water, Melzer’s, aniline blue lactic acid & Shear’s mounting fluid mounts although this wasn’t true of ascospores still retained in their asci. One-few groups of uncollapsed free spores with gelatinous sheaths although these were less obvious.

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Record Id: bf86192b-56d4-4782-9174-56223e35b03e

For additional information on this specimen, please contact: collections manager Timothy Whitfeld (museum-herbarium@umn.edu)

DNA barcode

Identifier:

Locus: internal transcribed spacer region of nuclear ribosomal DNA

URL: h

Notes: see also MIN# 938093, 938094 & 938096