Observation 19639: Geastrum Pers.

When: 2009-03-21

Collection location: Kaipara harbour, Auckland, New Zealand [Click for map]

Who: Michael W (Michael Wallace)

Specimen available

An unusual puffball like mushroom found fruiting at the base of a tree fern!
Fruitbody: 10-15mm in diameter by 10-15mm tall. Acutely umbonate. Light greyish brown. Peridium white, bruising faint red when cut.
Stipe: A small remnant of a stipe, 2mm long by 3mm in diameter, attached to soil by thick white rhizomorphs up to 25mm long by 1-1.5mm in diameter.
Spore mass: Made up of elongated chambers. White.


Copyright © 2009 Michael
Copyright © 2009 Michael
Copyright © 2009 Michael
Copyright © 2009 Michael
Copyright © 2009 Michael
Copyright © 2009 Michael
Copyright © 2009 Michael
Spores. All microscopy scale divisions =2.5 microns.
Copyright © 2009 Michael
Copyright © 2009 Michael

Proposed Names

28% (1)
Recognized by sight
83% (3)
Recognized by sight: possibly Geastrum rufescens when it’s bruising red – but it should have been larger..

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Geastrum sp
By: Clive Shirley (myxo)
2009-03-21 14:07:36 CDT (-0500)

I too feel this is an immature earthstar, likely from its size and location to be Geastrum saccatum. See the bottom image on this page.

By: Michael W (Michael Wallace)
2009-03-21 06:53:44 CDT (-0500)

I agree now, I will get more images when they have matured, other Geastrum species that I have cross sectioned before have had a noticeable separate spore chamber inside the peridium and the spore mass has been very dark, even when not open!

How do you know
By: Irene Andersson (irenea)
2009-03-21 06:47:00 CDT (-0500)

if it’s still immature and just not opened yet?

By: Michael W (Michael Wallace)
2009-03-21 06:14:46 CDT (-0500)

I don’t think this is a Geastrum species, this doesn’t open up like a star and the spores are white, also there is no seperate spore chamber inside the peridium!
The spore mass very closely resembles that of Notholepiota areolata.

Actually, looking at this again I think you are right, I need to get more images when they have matured more!

Created: 2009-03-21 05:31:18 CDT (-0500)
Last modified: 2009-03-21 05:31:18 CDT (-0500)
Viewed: 73 times, last viewed: 2017-10-30 11:38:21 CDT (-0500)