Name: Ramaria thiersii R.H. Petersen & Scates
Most Confident Observations:
Version: 1

First person to use this name on MO: Michael Wood


Rank: Species

Status: Accepted

Name: Ramaria thiersii

ICN Identifier: missing

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Author: R.H. Petersen & Scates


Brief Description: [See More | Edit]

FRUIT BODY 3–8 cm across, 7–15 cm tall, stipe thick to massive, cylindric, crown compact at first, often completely buried under duff, becoming more sparse and leggy in age. Tips whitish if under duff, pale yellowish, greenish yellow or straw-yellow when exposed. Branches whitish to pale yellow, to pale ochre-yellow when spores mature. STIPE 3–7 cm long, 2–6 (8) cm thick, triangu- lar, narrowing towards base, to nearly cylindrical, often thick, chunky. White, at times with brownish stains in age. Slowly staining brownish when handled. FLESH thick, soft to spongy and white in stipe. Branches stringy-fibrous, white to pale salmon-yellow. ODOR indistinct. TASTE indistinct. CHEMICAL REACTIONS: Flesh inamyloid, FeSO4 negative. SPORE DEPOSIT unknown. MICROSCOPY: Spores 11.6–15.8 × 4–5 μm, averaging 13.3 μm long, cylindrical to narrowly ellipsoid, obscurely roughened, and ornamented with small, low warts. Basidia with basal clamps.
ECOLOGY: Solitary or scattered on ground, often buried, forming “mushhumps” of pushed up duff. Ectomycorrhizal; likely with fir (Abies spp.). Fruiting in spring or early summer.
SIMILAR SPECIES: Members of the Ramaria rasilispora/magnipes complex typi- cally have brighter yellow to greenish yellow tips and yellow to yellow-orange branches when young, a large, rounded to compact stipe, and white flesh. Paler or older specimens can be difficult to distinguish from R. thiersii. With experience, you may begin to be able to use stature differences: more upright, subcylindrical overall, with a triangular stipe in R. thiersii; more rounded and compact in the R. rasilispora/magnipes complex. Additionally, fruit bodies of the R. rasilispora/ magnipes complex have slowly amyloid flesh, typically lack any brown staining (although this doesn’t appear to be a reliably useful feature), and have smaller spores that are smooth, or are ornamented with a few slender ridges. R. rasilis- pora/magnipes are very common in spring and early summer in the California mountains, occurring with fir and pine. Ramaria vinosimaculans has ivory to cream-colored branches and yellowish tips when young, as well as burgundy stains on the lower branches and stipe. Ramaria caulifloriformis has dense, cauliflower- shaped fruit bodies with a large stem and lots of abortive branchlets at the apex, and pinkish beige to pinkish buff branches and tips.


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