Fat jack
Suillus caerulescens
A species of Slippery jacks. Also known as Blue-staining suillus.
The plump bolete, a member of the bolete family, thrives beneath Douglas Firs on North America's western seaboard. Its pale yellow pore surface discolors to brown upon bruising or rubbing. These fungi typically emit a gentle and agreeable, occasionally citrusy, aroma.
In This Article
Attributes of Fat jack
Cap Diameter
5 - 15 cm
Height
5 - 10 cm
Cap
Cap 6 - 14 cm; convex or flat; yellowish brown to tawny; smooth
Cap Shape
Convex, Flat
Cap Surfaces
Slimy or slightly sticky, Fibrillose-scaly
Stem
Stem 3 - 8 cm long, 2 - 3 cm thick; equal; yellowish, brownish; smooth
Stem Shapes
Cylindrical
Stem Surfaces
Fibrillose
Flesh
Thick; pale yellow; staining blue in the stem base when exposed
Ring
With Ring
Spore Print Color
Cinnamon brown
Odor
Fragrant, not particularly distinctive.
Body Color
BrownYellowBronze
Flesh Bruises
Discolor to blue
Growth Form
Solitary, Gregarious, Scattered
Nutrient Gathering
Mycorrhizal
Substrate
On soil
You can find Fat jack by these plants
Common douglas-fir
Occurence Habitats
Coniferous Woodland
Species Status
Common in western North America
Endangered Species
No
Scientific Classification of Fat jack
Phylum
Club fungi
Class
Mushroom-forming fungi
Order
Boletes and allies
Family
Suillaceae
Genus
Slippery jacks
Toxicity and Edibility of Fat jack
Is Fat jack Toxic?
Consumption of 'fat jack' may trigger a spectrum of allergic responses, ranging from minor to critical. These can include dermatological reactions, pruritus, oral edema, gastrointestinal distress, breathing difficulties, and in severe instances, anaphylactic shock.
Type of poisoning
Allergic
Toxic Severity
Low toxicity
Incubation Period
0.5-24 hours
Poisoning Symptoms
Individual responses to a mushroom allergy can differ widely, with reactions spanning from slight to intense, including skin rashes, itching, swelling in the mouth, stomach upset, and respiratory issues. In severe cases, it can lead to anaphylaxis, which requires immediate medical attention.
