Observation 21691: Erineum

When: 2009-06-04

Collection location: Forest near Elgin St., Pembroke, Ontario, Canada [Click for map]

Who: Paul Derbyshire (Twizzler)

No specimen available

I found a maple in Zone 01 (depicted) and another in Zone 24 (big white pines and scattered, much smaller birch and maple with nearly no undergrowth) afflicted with … whatever this is. The pink stuff almost looks crystalline.



Proposed Names

-8% (2)
Recognized by sight
18% (2)
Recognized by sight: looks like a fungus but isn’t
Used references: David Arora
81% (1)
Recognized by sight

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: Irene Andersson (irenea)
2009-06-06 05:25:38 CDT (-0400)

An adult female has layed eggs where the galls are developing. I wonder how small the eggs are..?

I’m not sure what stage of growth this is (probably early), but I finally found close-up pictures showing a similar structure:

I still wonder what the best name on this obs should be, maybe the insect’s genus name (Eriophyes sp. ?)

That looks much more like it
By: Paul Derbyshire (Twizzler)
2009-06-05 17:50:45 CDT (-0400)

Bugs cause this? It said they are 0.2mm across, but also that this was too small to see with a hand lens. I find that a bit odd, since I can see features that small without any lens. I didn’t notice anything moving. The camera also can resolve features that small, in macro shots like the one I took. I see maybe one or two a-few-pixels-wide dark spots in there. Maybe the causative agents were mostly elsewhere at the time of the photo though?

I’m sure
By: Irene Andersson (irenea)
2009-06-05 17:45:50 CDT (-0400)

The colour of these galls can vary, more or less pinkish.
Here’s another example, more like yours:

I hesitated to give it a name, because it’s not a fungus, but since it often is mistaken for rust, it may be a good idea after all.

Pseudocarp is something different – a fleshy part of a fruit, like the inner part of strawberries or outer part of apples.

You think so?
By: Paul Derbyshire (Twizzler)
2009-06-05 12:52:47 CDT (-0400)

That site describes them as red, crimson, or green hairy patches. This is distinctly pink and looks more like sand grains than hairs.

No rust
By: Irene Andersson (irenea)
2009-06-05 02:20:55 CDT (-0400)

You can call it “Erineum”, caused by a gall mite:

Created: 2009-06-04 21:54:40 CDT (-0400)
Last modified: 2009-06-04 21:54:40 CDT (-0400)
Viewed: 106 times, last viewed: 2017-06-06 00:15:27 CDT (-0400)
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