Thecaphora californica (Harkn.) G. P. Clinton 1902

Thecaphora californica (Hark.) Clinton, Jour. Myc. 8 : 146. 1902
Sorosporium californicum Hark. Bull. Calif. Acad. Sci. 1 : 161. 1885.
Sori rather indefinite in the fiower-heads, more or less destroying the fiorets ; spore-, balls rather firm, chiefly subspherical, composed of 7-20 spores, 22-38/^ in diameter ; spores light yellowish-brown, chiefly triangular to polygonal or subcircular in cross-section, with contiguous sides flat and smooth and' free surfaces rounded and prominently verruculose, chiefly 11-17 /^ in length.
On Carduaceae :
Grindelia robusta, California. Type locality : Antioch, California, on Grindelia robusta. Distribution : California.