Observation 295717: Mycena thymicola Velen.

Notes:
Collection_#: OMS 300221
Collector: Joe Cohen
Identifier: Sava Krstic
Habitat: Suburban grass
Substrate: Soil under grass, clover, pine needles
Nearest_Tree: 2-needle pine Pinus contorta (Lodgepole / Shore Pine) ?
Habit: Many
Micro: Spore size:
(8.1) 8.7 – 10.2 (10.9) × (4.7) 5 – 5.8 (6) µm
Q = (1.5) 1.6 – 1.9 (2) ; N = 20
Me = 9.2 × 5.3 µm ; Qe = 1.7
Piximètre 5.9 R 1530 : le 26/10/2017 à 15:51:58.4503670
Other:
Gills 20 rows reaching stem; 1 row of sub-gills.
Photos Photos may show a mixed collection (note one sporocarp with dark stem). If so, the Observation is meant to include only the others.
lat/lon manual, from GoogleMaps, margin of error ~ 3m

Species Lists

Images

IMG_0455.jpg
IMG_0454.jpg
IMG_0461.jpg
OMS 300221 Mycena 2X.jpg
See original image for scale bar.
OMS 300221 Mycena 4X.jpg
Enlarge photo to see small scale bar and measured feature (cystidium?)
OMS 300221 spores congo red (1).jpg
Spores Congo Red
OMS 300221 spores Melzers (1).jpg
Spores Melzer’s
Screen Shot 2017-10-28 at 07.55.54.JPG
Caulocystidium
Screen Shot 2017-10-28 at 07.56.39.JPG
Caulocystidium
OMS 300221.jpg

Proposed Names

-11% (2)
Recognized by sight: This collection is from the same location, at close to the same time of year, as Observation 290911.
61% (3)
Recognized by sight

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= Observer’s choice
= Current consensus

Comments

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M. thymicola
By: Matt Gordon (Matt G)
2018-02-02 16:16:42 EST (-0500)

So this Mycena is Robich’s thymicola, and thymicola is a separate from olivaceomarginata. If thymicola was published by Robich in 2007, I wonder why it’s not in Index Fungorum as a species.

Definitely a Robich collection
By: Joseph D. Cohen (Joe Cohen)
2018-01-26 07:26:29 EST (-0500)

The article1 has a collection data spreadsheet (Table S1)2 , which — in relevant part — says:

Organism GenBank Accession Collected by Collection date Country
Mycena thymicola JF908483 G. Robich/M. Castoldi 10-Nov-2002 Italy

1 Osmundson, et al.. (2013). Filling Gaps in Biodiversity Knowledge for Macrofungi: Contributions and Assessment of an Herbarium Collection DNA Barcode Sequencing Project. PLoS ONE, 8(4), e62419. http://doi.org/10.1371/journal.pone.0062419

2 https://doi.org/10.1371/journal.pone.0062419.s003

Nice finding; thanks to Matt
By: Sava Krstic (sava)
2018-01-26 03:47:52 EST (-0500)

In an 1983 study, Maas Geesteranus said: “Whether thymicola should be taken to represent a variety or an independent species must be left undecided for the moment, but it certainly seems a recognizable entity”. In 1988, he decided that thymicola should be considered just as a form of olivaceomarginata characterized by absence of yellow tints in cap and stem — a character that he does not establish a sharp enough line between the two.

In Giovanni Robich, Mycena d’Europa (2007), M. thymicola is presented as a species distinct from M. olivaceomarginata. The sequenced thymicola Matt found on GenBank seems to be Robich’s collection (he is one of the paper’s authors).

ITS sequence thoughts
By: Matt Gordon (Matt G)
2018-01-05 12:40:46 EST (-0500)

The ITS sequence is close to one named entry in GenBank: Mycena thymicola https://www.ncbi.nlm.nih.gov/.... However, Index Fungorum says that M. thymicola has been synonomized with M. olivaceomarginata, but the M. thymicola sequence is only about 91% similar to the two M. olivaceomarginata in GenBank, so one or all of these are incorrectly named in GenBank. The one M aetites ITS sequence in GenBank is less than 80% similar to MO 295717. Of course we don’t know if that is correctly named. One thing we can say for sure is that this species, whatever it may be, is present in both Europe (Italy) and the PNW.

M. aetities
By: Joseph D. Cohen (Joe Cohen)
2017-10-26 03:54:06 EDT (-0400)

This collection is from the same location, at close to the same time of year, as Observation 290911.

Created: 2017-10-25 20:37:56 EDT (-0400)
Last modified: 2018-02-02 16:28:20 EST (-0500)
Viewed: 224 times, last viewed: 2019-06-24 12:53:38 EDT (-0400)
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