When: 2008-04-15

Collection location: Slate Creek Rd, Humboldt Co., California, USA [Click for map]

Who: John Harlan (harlanx6)

No specimen available

Notice the fruiting bodies, like little 1/4" mushrooms.


Proposed Names

-73% (3)
Recognized by sight
-62% (2)
Recognized by sight: Looks like the tube lichens I’ve seen before in Humboldt Co.
Used references: In Lichens of North America by Brodo, Sharnoff & Sharnoff the photo of this species seems like a pretty good match. It also discusses H. imshaugii. The only reliable difference is a chemical reaction (PD- for H. inactiva), but H. inactiva seems more delicate based on the photos and it tends to be more coastal.
91% (2)
Recognized by sight: John tells me the medullary ceiling is white.

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= Observer’s choice
= Current consensus


Add Comment
H. imshaugii group versus H. inactiva
By: Jason Hollinger (jason)
2008-04-25 13:36:07 CDT (-0400)

These are notoriously hard to differentiate. Aside from the medullary PD reaction (nearly always PD+o/r in H. imshaugii group), the other difference is H.imshaugii group has a white interior throughout, while H. inactiva darkens toward the center. Trevor Goward assures me this is foolproof. Inland you can rule out H. inactiva with 90% confidence, but at the coast it can be either.