Slideshow image
Pilophorus robustus Th. Fr.
Family: Cladoniaceae
Pilophorus robustus image
Stephen Sharnoff  
Thompson, J., 1984. American Arctic Lichens: The Macrolichens.
Primary thallus granular, gray-green with the brown cephalodia scattered and also on base of podetia; the thallus evanescent. Pseudopodetia stout, irregularly to unbellately branched above, to 2.5 cm tall, not becoming hollow; the hyphae strongly gelatinized, pachydermatous, the cells vertically oriented, algal layer glome-rulate. Apothecia numerous, crowded at the tips of the branches, to 2.5 mm broad, globose; margin of the hymenium incurved and reversing upward before uniting with the pseudopodetium surface, the center with the vegetative tissue extending up into the center of the apothecium and lacking a boundary layer at the base of the apothecium; hymenium 200 μ; asci 8 spored; spores simple, hyaline, spherical to becoming spindle-shaped, 4.0-6.5 x 18-24 μ.

Reactions: K+ yellow.

Contents: atranorin and zeorin.

This species grows on rocks and gravels and on outcrops. It is circumpolar but apparently rather disjunct, occurring in Alaska and Greenland in our area.

Pilophorus robustus image
Lucy Taylor  
Pilophorus robustus image
Stephen Sharnoff  
Pilophorus robustus image
Pilophorus robustus image
Pilophorus robustus image
Pilophorus robustus image
Pilophorus robustus image
Pilophorus robustus image
Pilophorus robustus image
Pilophorus robustus image
Pilophorus robustus image
Pilophorus robustus image
Pilophorus robustus image
Pilophorus robustus image
Pilophorus robustus image
Pilophorus robustus image
Pilophorus robustus image
Pilophorus robustus image