Observation 73498: Suillus riparius Thiers

Gregarious, growing from underneath dead logs and rocks, probably due to the higher moisture content in those areas. Presumably growing with sugar pine (the only five-needled pine in the vicinity) but ponderosa pine and white fir were also present. The ground cover was almost exclusively dead wood and litter, with a few parasitic plants (pinedrops and coralroot). I found several patches of them in the same area over three days.
Pileus yellow and viscid with scattered reddish-brown fibrils. Stipe yellowish, covered in white to pinkish glandular dots that were exuding resinous goo in copious quantities. Both the dots and the resin turned dark brown with handling. The base of the stipe was covered with white, downy mycelium and white rhizomorphs were visible extending into the litter. Some specimens had an annulus (not visible in the photos), and a few seemed to have veil remnants around the margin of the pileus. The pores were large (1-4 mm) and dull yellowish to yellowish-brown.
Dried specimens are in my personal collection.



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Used references: Arora: Mushrooms Demystified, 2nd ed., Thiers: California Mushrooms – A Field Guide to the Boletes

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Created: 2011-08-06 18:26:01 PDT (-0700)
Last modified: 2015-10-11 22:23:24 PDT (-0700)
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