—82— 



PoLYBLASTiA Intercedens (Nyl.) Lonnr. Flora 41: 630. 1858. 



Verrucaria intercedens Nyl. Expos. Synop. Pyrenocarp. 33. 1858. 



Thallus indeterminate, thin, uniform, microscopically fissured, greenish- 

 yellow or olivaceous; no chemical reactions. Apothecia small to minute, ,4 to 

 .9 mm. in diameter, conical, almost completely immersed, the epithecium ap- 

 pearing as a minute dark speck at the apex; perithecium entire, yellowish brown; 

 amphithecium pale; paraphyses none or scanty when present, simple, thread- 

 like, and twining; asci elongate-cylindrical, 14 to 16. 4^1 broad and 68.4 to 82 fj, 

 long; asci and spores yellow-brown with I; spores colorless, muriform, oblong, 

 9 to i2/i broad and 18 to 30/x long; longitudinal rows of cells 2 to 4, the trans- 

 verse series 6 to 10. 



Known to occur only on sandstone at Alum Rock Park, in the Mt. Hamil- 

 ton range. Altitude about 150 meters. 



Trimmatothele umbellulariae Herre, sp. nov. 



Thallus very thin, forming a grayish dusky effuse patch very obscure and 

 not affected by reagents. Apothecia exceedingly minute, .1 to .3 mm. in diam- 

 eter, black, conical or hemispherical, the apical pore visible only with a strong 

 lens; perithecium dimidiate, black; paraphyses wanting, asci not plainly evi- 

 dent; spores exceedingly numerous, simple, oval or short elhpsoid, colorless, 

 becoming yellowish with I, 2 to 2.5^1 broad and 2.5 to t^/jl long. 



On bark of living Umhellularia calif ornica, in the hills of Berkeley; altitude 

 about 125 meters. The specimens of this almost unnoticeable lichen are very 

 scanty. Type in the author's herbarium. 



Chaenotheca phaeocephalum (Turn.) Th. Fr. Nov. Act. Soc. Aps. III. 3: 

 351. 1861. 



Lichen phaeocephalus Turn. Trans. Linn. Soc. Lond. 8: 260. pi. 6,.f. i, 1807. 



Chaenotheca phaeocephala Fink. Contr. U. S. Nat. Herb. 14: 49. 19 10. 



Thallus of minute, gray, ashy, or yellowish green granules which are more 

 or less congested, rarely larger and more or less squamulose, with an almost 

 crenate margin. Stipes usually slender, short, .75 to 2. mm. in height, black- 

 ish brown, rarely branched and bearing 2 or 3 apothecia, sometimes clustered 

 or a number arising from a common point; apothecia small, .2 to .8 mm. in 

 diameter, top-shaped, the summit fiat or slightly convex and more or less yel- 

 low or greenish-yellow pruinose, rarely brown; hypothecium dark brown; thecium 

 pale below, very pale brown above; paraphyses simple or sometimes branched, 

 slender, sinuous; asci imperfectly made out, very slender, cylindrical, soon 

 dehquescing; spores simple, spherical, brown, at first nearly colorless, 2.75 to 

 5m in diameter. 



Rare; on an old redwood post in the Oakland Hills; at an altitude of about 

 175 meters. In the University of California herbarium, from Sonoma county, 

 collection of F. T. Bioletti. Recorded by Tuckerman from New Bedford, 

 Massachusetts, and from Canada; from Minnesota by Bruce Fink, and from 

 the Rocky Mountains and from Vancouver Island by J. M. Macoun. 



