Attack of the dog-vomit slime mold!

Viewer discretion is advised!

About two weeks ago I noticed a weird and disgusting-looking bright-yellow blob on the wood-chip mulch under the Douglas fir in my front yard. I’ve a pretty strong stomach. In fact, I’m usually the one who grosses other folk out just for the craic of it. But the thought of some poor animal being so ill as to have throw this up in my front yard was too much. I really hoped it wasn’t one of the three rather mangy cats that have taken to patrolling the property this year. We call them the squirrel patrol, since we’ve seen less squirrel activity since they showed up.

Last year was the year of the rat, and the year before, the year of the snake. The snake left, the rats showed up and now we have the cats/squirrel patrol, and as much as I’d prefer to have the snakes back I do hate the thought of one of those moggies being that ill. I mean the blob was 10 inched in diameter and about an inch thick. (How do you spell the sound you make when you dry-retch? Probably good that I don’t know!)

A rather more haunting thought was what if it was human vomit? Maybe some homeless guy? With some rare and dangerous disease? Yikes! It was with great trepidation that I opened the (always unlocked) garden shed that day. Thankfully it was empty. But I did steal myself for finding some sort of creature dead on the property for the next few days.

I invited Al (my neighbor) over to see if he could shed some light.
“A fungus,” he guessed, until he touched it with his foot. Bright orange goop welled up. Al jumped back. I gagged. He laughed.  At long last I’ve found someone who can out-gross even me!

As we both wiped our eyes, (for entirely different reasons)  I decided to cover it with the surrounding wood-chip mulch so that my stomach could settle, though it heaved every time I even thought about the bright orange stuff squeezing out from beneath the yellow foamy crust.

Several day later I was wasting time on facebook, (as you do) and I came across a post by a Master Gardener buddy. She had posted a photo of something that looked like my blob and asked what it was. Another Master Gardener commented, “Slime mold.”

In a  flash my nausea was cured, so much so that I was brave enough to google image – slime molds. And there I saw my blob under the very apt name of “Dog Vomit Slime mold – Fuligo septica.” Click on the link if your stomach is strong enough to see what you get when you google image “Dog Vomit Slime Mold.” Cool, right?

I was so annoyed that I had covered up the one I’d found. Clearing the wood-chips away revealed it again, but it looked a little beat up.

The pen was added to show scale, and remember this is it after it has dried out and shrunk a little.

So what is a slime mold?

Well, these thins are pretty amazing in a freaky Startrek kind of a way. First of all, they are not a fungus nor a plant but belong to the Phylum Amoebozoa. The slime mold is a bunch of single-celled organisms (amoeba) that have gathered together and act as a single organism called a plasmodium. Studies have show that there is some kind of communication between these individual cells such that they can co-ordinate themselves to move. Yes, I said, “Move!” Collaboration of this kind is of great interest to cell biologists and also transit providers! The latter study how the slime mold “hunt” down food, moving from one place to the next along the most efficient route.

They feed by engulfing their food. In the F. septica’s (a much nicer name I’m sure you’ll agree!) case rotten wood and bark. You can see a slime tail at one side of them that shows their direction of movement. And so, even though I have radically changed my stomach churning attitude towards these strange amalgamated-cell creatures, I wasn’t overly happy that the direction of movement was towards the house!

Then yesterday, My Husband and I were out in the garden.  He was walking in front of me on the concrete path, and I happened to glance down and see another F. septica right by his foot.

Oblivious to it, he walked on, but I excitedly yelled, “There’s another one.” My raised tone must have translated as alarm to My Husband’s ears. He quickly turned and came running back to me, stepping in the slime mold and skidding on it! Fortunately he didn’t fall. I was torn between laughing at his banana-skin skid and being annoyed at him for wrecking my potential photo op (since I’d wrecked the last one!) I’m sure the slime mold was none too pleased either…

We photographed it anyway.

This shot shows three things.

  1. The inside is brown not orange like the last one – this means that it has turned into spores. I’d really like to think that this is why the plasmodium has climbed up on to the path, They tend to release theirs spores on higher ground. How do they determine “higher ground”? Do some of the amoebas train as quantity surveyors then tell the rest of the gang? Or do they get more tired crawling up hill (something akin to me jogging uphill – though an amoeba would be relatively faster!) and just know? I suppose if plants can tell which way is down, these guys have some means of determining uphill.
  2. You can see the direction of travel of the slime mold by the trail it leaves from the mulch up onto the concrete. Disconcertingly enough this one was also headed towards the house!
  3. You can see the direction of travel of My Husband when he skidded. Perpendicular to the slime mold’s direction of travel though that is purely coincidental!

Isn’t nature full of surprises?

So, till next time, I’ll say “Adios amoebas!”

Byddi Lee

11 replies to Attack of the dog-vomit slime mold!

  1. I've found this slime mold here a couple of times, and I agree, it's not the most attractive looking. It really does look like vomit from a dog that's been fed a cheap corn-filler based dog food! I'd much rather find Leocarpis fragilis. As slime molds go, that one's much prettier. I think if you search our blog for 'slime mold' there's a picture, both of the plasmodial phase, and the spore stage. Regardless, slime molds really are quite fascinating!

  2. Thanks – did just that! loved the time-lapse photography at the end. For anyone wanting a less hysterical and more sensible view of slime molds check out the photos at Curbstone Valley Farm -

    Your blog is so professional – great job!

  3. Pure ming.

  4. LOL -haven't heard that in a long time!

  5. Thanks for this. I seriously thought I had a mutant fox barfing all over my front flower garden. I'm fairly certain it is several clumps of f. spetica!

  6. Is there any way to get rid of it though??

  7. You can hose it away but it doesn't do any harm and eventually it dries up and just disintegrates.

  8. Greetings! Do you own any writing education or this is a pure natural gift of yours? Can't wait to see your answer.

  9. I'm a scientist by education and a self taught writer other than high school English! Now that I'm writing a novel, I have a critiquing group who have been an invaluable help on all aspects of writing. They tell me that I tend to over use exclamation marks! Imagine that!

  10. you learn't all that but never told us how to kill it off hahahha

  11. I guess it’s better that you found it in the concrete path rather than sticking on the side of your house. Though I wouldn’t mind some growing in the garden, once it starts spreading in the exterior or, God forbid, inside the house, then I would freak out. Nice perpendicular skid, btw. Haha!


Comments are closed.