When: 2007-12-07

Collection location: Buttonwood, south Key Largo, Monroe Co., Florida, USA [Click for map]

Who: Jason Hollinger (jason)

Specimen available

small earthstar, on small fallen stopper (Eugenia axillaris) (1-2" thick and bark still on), surrounded by copious white stains from mycelium
ST: short
CAP: 6-8mm wide, round, tapering at bottom to point of attachment
OUTSIDE SKIN: roughened, creamy whitish to brownish outside, splitting into 5 neat spreading segments when moist, rays ~6×4mm, dull brown and smooth inside with whitish bloom
INSIDE BALL: 1-2mm smaller, lt brown, pucker at tip with small well-defined pore, whitish around pore (v minute tomentum?), flabby and soft
SPORE: print dark smoky brown, spore mass is v diffuse and cottony

Clearly in the A. hygrometricus group due to hygroscopic behavior, but I don’t think it’s possible to be more specific without microscopic details of spores.

Excellent, Darvin has corrected me. I need to be more careful of using the “groups” in Demystified!

Species Lists


Proposed Names

87% (1)
Used references: Scott Bates determined this for me. A “large form of mirabile” but sufficiently different that he thinks it a separate species. I guess the white mycelium is called a “subiculum”, particularly prominant in this example.

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= Observer’s choice
= Current consensus


Add Comment
Wow, this is an incredible species!
By: Christian (Christian Schwarz)
2011-11-29 00:26:29 EST (-0500)
By: Darvin DeShazer (darv)
2007-12-10 22:34:11 EST (-0500)

Geastrum also has many species with hygroscopic behavior. G. corollinum looks close but I didn’t find a record of it on wood. Nice photo on a log! Astraeus has only two species and this is not one of them.