Observation 7560: Dasyscyphus Nees ex Gray (Site ID) (Lachnum)

When: 2008-05-14

Collection location: Edgewood Blue, Wells Gray region, British Columbia, Canada [Click for map]

Who: Jason Hollinger (jason)

Specimen available

on half-rotten thin small leaf (herb?), scattered all over it
APOTHECIA: v minutely stalked, densely short whitish shaggy, disk slightly darker pinkish-brownish but still very pale, all parts K negative
ASCI: smallish, cylindrical but tapered below half, rounded tip, staining rather golden brownish in Lugol’s, smooth, width (3.6)4.7+/-0.7(5.7) µm (N=6)
PARAPHYSES: much longer than asci, thick, pointed end, septate, not at all constricted, smooth, IKI negative to somewhat golden brown
SPORES: comet-shaped to narrowly oblong, smooth?, (7.5)9.5+/-1(11) x (1.5)1.8+/-0.25(2.2) µm, Q = (4.7)5.1+/-0.3(5.6) (N=7), at least 4 per ascus possibly more?, packed into top half diagonally

There’s quite a selection of these minute fungi in Fungi of Switzerland growing on a host of improbable substrates, from dead horsetail stalks to leaves of a single species of Vaccinium, but all have those same cool paraphyses.

Species Lists


Taken at 1000x, stained with Lugol’s. Note the conspicuous spikey paraphyses.
Taken at 1000x, stained in Lugol’s. Is there a structure at the very tip??

Proposed Names

58% (1)
Used references: Fungi of Switzerland.
Based on microscopic features: Funky lanceate paraphyses.

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= Observer’s choice
= Current consensus


Add Comment
Microscopic details of hairs important.
By: Jason Hollinger (jason)
2008-05-20 21:24:29 BST (+0100)

In addition to relative size of spores, asci and paraphyses, glancing back through Fungi of Switzerland, I see that the hairs differ markedly from species to species. Sadly I have not taken the time to make the necessary observations.

Without a treatment that at least pretended to cover a sizable percentage of the genus (and possibly related genera?), I would feel very uncomfortable lumping this with any other species.

Dasyscyphus virgineus
By: Douglas Smith (douglas)
2008-05-20 16:24:53 BST (+0100)

Well, on woody substrate I found something I id’ed as Dasyscyphus virgineus, in the spring in the Sierras. Darvin found something similar that he id’ed as Lachnum virgineum, which I believe is a synonym.

Not sure what might make the difference between these and other lanceolate paraphases type guys, but you could group these together for now, since microscopically they look the same.