Observation 103253: Ustilaginomycetes

When: 2012-06-15

Collection location: Fair Oaks, California, USA [Click for map]

Who: Byrain

No specimen available

Growing on an unidentified grass, the observation date reflects when it was found, the macro pictures were taken 7/18/12.
The spores are densely spiny and globose, the spines are ~ 1 µ long, and the spores have a 1 µ thick wall.

Spore range = 8 – 10 × 7 – 9 µ
Average spore = 9 × 8.17 µ
Average Q = 1.11
15 spores measured.


Spores, 1000x, mounted in KOH, 1 µ divisions

Proposed Names

28% (1)
Recognized by sight: On Bromus diandrus.
Used references: http://bit.ly/NPj51z
Based on microscopic features
57% (1)
Eye3 Eyes3
Recognized by sight: I was informed of other species this could be, but the spore ornamentation is not clear enough for determination.

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
I asked a…
By: Byrain
2015-04-30 16:37:49 BST (+0100)

plant pathologist/mycologist that did their thesis on smut fungi and was informed of other possible taxa (Tilletia bromi) and how the spore ornamentation wasn’t clear enough for determination. I should of changed the names a while ago, but I forgot. Also I chose Ustilaginomycetes mostly because I was having trouble narrowing it down any further.

By: Danny Newman (myxomop)
2015-04-29 02:43:09 BST (+0100)

which Fungi of Panama list? Why the reversion all the way back to Ustilaginomycetes?

Ustilago bullata on Bromus diandrus?
By: Byrain
2012-07-29 18:42:05 BST (+0100)

After being told that the grass looks like wild oats, I was able to find Bromus diandrus which looks similar to me and searching for smuts on it brings me to Ustilago bullata which seems to infect a few different Bromus spp. However I cannot find any descriptions, anyone know where to look?

Also, how do you remove this from the fungi of Panama species list?

By: Darvin DeShazer (darv)
2012-07-29 07:04:49 BST (+0100)

Time to visit UC Davis. There must be a plant pathologist in the Ag Dept who has seen this before.

By: Byrain
2012-07-29 06:53:57 BST (+0100)

Could it be a smut fungus? The way the spore mass looks reminded me of Ustilago maydis and after a lot of searching I think I need to know what the grass is called…

By: Darvin DeShazer (darv)
2012-07-29 06:13:43 BST (+0100)

The spores look like a rust.

Created: 2012-07-29 03:38:10 BST (+0100)
Last modified: 2015-04-25 17:12:28 BST (+0100)
Viewed: 158 times, last viewed: 2017-06-13 15:43:51 BST (+0100)
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