40 CALIFORNIA ACADEMY OF SCIENCES. 



forming an oblong mass, with crenate borders, ,/u 40 — 45x 

 18—22. 



On dead stems of Corylns rostrata. Sausalito, Dec. 

 Feb. 2929. 



Entyloma Collinsise. 



Forming white spots 2 mm. in diameter on the leaves; 



spores attached to slender radiating threads, globose hya- 

 line; epispore thick. M 10 — 12. 



On leaves of Collinsia bartshefolia. Tamalpais, Feb. 



3143. 

 Entyloma Eschscholtziae 



Forming white spots 1 — 2 mm. in diameter; spores hya- 

 line, attached to thick, branching, threads, irregular in 

 shape; epispore thick. /< 10 — 5. 



On living leaves of Eschscholtzia Californica. San Fran- 

 cisco, Feb. 3117. 



Sphserotheca lanestris. 



Conidia: Oidum ventricosum, Hk. Segments swelling in 

 the centre and becoming barrel-shaped /* 34 — 38 X 20 — 22, 

 and filled with numerous round or elliptic bodies, 

 M 5 — 6 X 2 — 4, which are freely discharged from the ends, 

 as the joints separate. 



Ascophore: mycelium dense, persistent, arachnoid, yellow- 

 ish brown, in tufts 'f mm. in breadth, which becoming conflu- 

 ent, form a woolly stratum, often covering the entire lower 

 sufrace of the leaf : perithecia double, dark brown, the inner 

 formed of large, highly refracting, lryaline, cells: appendages 

 undistinguishable from the mycelium; asci ovate thick- 

 walled, thinner at the summit, and with a short stipe, 

 8-spored: sporidia elliptic or globose, granular. Peri- 

 thecia, fx 90—108. Asci, it 75 X 102. Sporid. ii 21 X 18. 



Very conspicuous upon the growing shoots of Quercus 

 agrifolia — the oidium as a white mealy stratum from Feb — 

 May, followed by the ascophore on the leaves below. San 

 Francisco. 3169. 



