Observation 218479: Marasmius cohaerens (Alb. & Schwein.) Cooke & Quél.

Growing in wood chunks and leaf litter under a dead oak. Spore print white.

Proposed Names

57% (1)
Based on chemical features: Close match with HQ665549

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
At first glance, this looks like a decent match for Marasmius cohaerens
By: Alan Rockefeller (Alan Rockefeller)
2018-02-24 01:33:28 EST (-0500)

At first glance, this looks like a decent match for Marasmius cohaerens, however I think that the top BLAST match is actually M. sullivantii, with the wrong name applied.

The reason I think that is that while there is only one M. sullivantii sequence in GenBank, which your sequence matches with pretty well, there are quite a few M. cohaerens sequences. The people who uploaded the M. sullivantii sequences do know what they are doing, and probably could provide you with that material to study (they have been super helpful when I have emailed them). There are at least three Marasmius species in GenBank going under M. cohaerens, and I think your sequence matches with the real M. cohaerens 84 – 86%, and that is why you don’t see them in your top 100 BLAST hits. For this analysis I am assuming that the M. cohaerens sequences with the most GenBank entries is the real M. cohaerens, and that should be verified by finding M. cohaerens, checking the microscopy and sequencing it. Or perhaps more easily by researching the various M. cohaerens sequences in GenBank and finding one which you trust has been correctly checked microscopically.

When identifying fungi using BLAST, often the top BLAST hit is the correct name, but not always. It is very helpful to request the top 250 or 500 hits, and scroll down the list. I BLASTed your sequence requesting 500 results and searched for cohaerens to do my analysis.

Sorting by ident and requesting a large number of matches is another trick that can bring relevant results to the top, but in this case it doesn’t help at all.

Created: 2015-10-11 14:57:24 EDT (-0400)
Last modified: 2018-02-24 01:33:29 EST (-0500)
Viewed: 29 times, last viewed: 2018-03-06 02:34:33 EST (-0500)
Show Log