When: 2017-05-19

Collection location: Tsukuba, Ibaragi, Japan [Click for map]

Who: lxjfx

Specimen available

Notes:
Growing on dead branch of hardwood

Gills white, adnate, margin entire L = 18, l = 1; stipe smooth, brittle, slightly twisted, bleeding watery fluid when cut; odor not distinctive; pleurocystidia absent

Images

P5211318.JPG
IMG_20170520_232909.jpg
Pileipellis (1 div = 1μm)
IMG_20170520_232426.jpg
Pileipellis (1 div = 1μm)
IMG_20170520_230750.jpg
Pileipellis (1 div = 1μm)
IMG_20170520_130026.jpg
IMG_20170519_124443.jpg
P5201314.JPG
P5201313.JPG
P5201312.JPG
P5201311.JPG
P5201309.JPG
P5201308.JPG
P5191304.JPG
IMG_20170523_220955.jpg
End cell of cortical layer of the stipe apex (1 div = 2.59μm)
IMG_20170523_214559.jpg
basidia with 2 sterigmata (1 div = 2.59μm)
IMG_20170523_214211.jpg
Cheilocystidia (1 div = 2.59μm)
IMG_20170523_214120.jpg
Cheilocystidia (1 div = 2.59μm)
IMG_20170523_214000.jpg
basidia with 4 sterigmata (1 div = 2.59μm)

Proposed Names

46% (2)
Recognized by sight
Used references:
- Fungi of Switzerland vol. 3
- http://www.mycena.no/polygramma1.htm
Based on microscopic features:
- Diverticulate outgrowth of pileipellis hyphae
- Shape of Cheilocystidia
28% (1)
Recognized by sight
28% (1)
Recognized by sight
Used references:
- comment from Sava Krstic

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

= Observer’s choice
= Current consensus

Comments

Add Comment
sava
By: lxjfx
2017-06-25 02:08:22 CDT (-0500)

Thanks for the helpful comment.
I will examine the specimen to see more caulocystidia.

lxjfx
By: Sava Krstic (sava)
2017-06-24 15:47:26 CDT (-0500)

Thanks for adding the microscopy. Now we know for sure the mushroom is in the section Fragilipedes and nothing seems to obviously contradict M. polygramma, which unfortunately is still not a solid proof. Common macro features of M. polygramma (largish size, strongly striate stem and cap) are absent, but as you point out, they don’t have to be present. The number of the gills reaching stem seems to be at the bottom of the range (23-40). Microscopically, the pileipellis looks good; cheilocystidia quite irregular, which fits too (though I’m puzzled by the basic symmetry of the cheilos, if we imagine their outgrowths cut off); caulocystidia apparently forked, which is good too (one would wish more caulo examples shown because that fork looks unexpectedly symmetric). There may be an issue with sterigmata: they appear to be twice the max size (7.5 microns in Maas Geesteranus).

Thanks again for the nice work here. It would be great to see more Japanese Mycena.

grooved stem
By: lxjfx
2017-06-24 07:17:42 CDT (-0500)

Although from the specific epithet one would expect Mycena polygramma to have frbs. with grooved (grammate) stipes, this feature is not always present for long and therefore cannot be used as a decisive character (MAAS GEESTERANUS 1988a).

Fungi of Switzerland, Vol. 3, p.286

Nice photos of the pileipellis
By: Sava Krstic (sava)
2017-05-23 02:49:54 CDT (-0500)

Brown or gray lignicolous Mycena are difficult to identify even microscopically. We need to see cheilocystidia and caulocystidia.

M. polygramma has longitudinally grooved stem, which distinguishes it from all other Mycenas.

Created: 2017-05-20 10:23:07 CDT (-0500)
Last modified: 2018-05-14 01:52:28 CDT (-0500)
Viewed: 235 times, last viewed: 2019-10-03 10:51:25 CDT (-0500)
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