Alaskan rust spores identified!

At long last, the news I've been waiting for!  The mysterious Alaskan orange goo, thought at first to have been eggs of something, or possibly the dinonflagellate Noctiluca, later discovered to be rust spores, has been positively identified. The mystery rust is Chrysomyxa ledicola, which causes spruce-labrador tea needle rust.  The spores identified were the urediniospores, which is known as the repeating stage of macrocyclic rusts.  It is common for rusts to produce ba-jillions of spores, especially urediniospores, to keep reinfecting their alternate hosts.  In this case, that alternate host is labrador tea Ledum spp., though the NCCOS webpage lists it as Rhododendron tomentosum.   That name isn't accepted by PLANTS.usda.gov, which is my source for this kind of information.  That fact helps explain how the source of the orange goo was originally so mysterious.  While the primary host, spruces (Picea spp.), are a group that would be difficult to hide that many spores on without someone taking notice, labrador tea is a common understory plant that wouldn't raise as many alarm flags.

What was the rust?

After posting yesterday, I was thinking about the great Alaskan orange goo story, and I tried to see if anyone has followed up.  Nope.  I was unable to find an answer as to what rust fungus produced that great cloud of orange that had Kivalina residents so concerned.  It is often a simultaneous joy and sorrow to find the holes in the Internet. 

Strange news

A friend of mine posted this on Facebook; an article about some orange goo washing up on a beach in Alaska.  At first they thought it might have been microscopic eggs of things.  Now they are saying that it's actually spores of a rust fungus.  Rusts are notoriously difficult fungi to work with because, for one thing, they have up to five different spore stages, and another, they are biotrophic, meaning they require a living host to survive and reproduce.  So if you don't have a living plant host, identification is especially difficult.   This is indeed some very strange news!

Update: 8/19/11.  Looks like I beat MSN to the punch! They're running the story on their front page today, though with few details.  Believe me,  I'll tell you what this thing turns out to be when I find out.  If I may stand on my soapbox for one small minute, this is an excellent example of why scientific illiteracy is a significant problem in our world. 

Old Fisheries Pond

I went out after a wet weekend to see if anything had come up. I did find a few things, like this lovely little Scutellinia scutellata, the eyelash fungus. This cute little asco is not in Bessette et al. or Weber and Smith, for some odd reason.  But it's here, for sure. 

Scutellinia scutellata, Pyronemataceae, Pezizales, Ascomycota

It seems as though Monday has been giant storm day over the past few weeks, with storms rolling in overnight and taking down trees.  All the moisture has had the cedar apple rust going gangbusters as well.

Telial horns out the wazoo! I did get a peak under a compound scope and saw the two-celled teliospores, which look like two cones facing each other.  I didn't see any basidia or basidiospores that I could discern, though.  I'll take another look later today.