Climacocystis borealis

Scientific name:   Climacocystis borealis (Fr.) Kotl. &
Derivation of name:   Climacocystis means growing in an
imbricate fashion like a staircase and having cystidia; borealis
means "northern" and refers to the northern range of this
Synonymy:   Polyporus borealis Fr.
Common names:  
Phylum:   Basidiomycota
Order:   Polyporales
Family:   Fomitopsidaceae
Occurrence on wood substrate:  Parasitic and saprophytic;
solitary or as overlapping clusters at the base of and on roots
of living conifers and on logs and stumps; found year-round. 
Dimensions: Caps 4-15 cm wide; 3-15 cm long; 0.5-4 cm
Upper surface:  Whitish at first, yellowish in age; hairy; soft
and watery when fresh.        
Pore surface: White, yellowish on drying; 1-3 per mm; pore
openings may be irregular and angular.
Edibility: Inedible.
Comments:  Climacocystis borealis causes a butt rot and
root rot of conifers. It continues as a saprobe on dead roots
and stumps. This species is circumglobal and boreal. It's
range extends south in mountainous areas.
More information at   

Figure 1. An overlapping cluster of caps of Climacocystis
. Photo © Dianna Smith.

Figure 2. Upper surface. Photo © Gary Emberger.

Figure 3. The color of the pore surface is about the same as
the upper surface. Photo © Gary Emberger.

Figure 4. Note the somewhat irregular shape of some of the
pores. Photo © Tom Volk.


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