CALIFORNIA ACADEMY OF SCIENCES. 167 



to the true sporidion. Asci 16x120; Sporid. 8x16.//. On 

 leaves of Amelanchier alnifulia, covering the whole lower 

 surface of all the leaves of the affected branch, Emigrant 

 Gap, Sierra Nevada, 5,000 feet alt. Autumn. 3577. 



Although this differs very strikingly in appearance from 

 P. morbosa, it is nevertheless very nearly related. The per- 

 ithecia are much smaller, and, though seated on a subicu- 

 lum, are all separate; the sporidia are rounded instead of 

 acuminate below. In habit it is very distinct, being entire- 

 ly confined to the lower surface of the leaves. 



Microthyrium microscopicum Desni. — On Spartina jun- 

 cea, San Francisco, Feb. 3049. 



Glonium stellatum. — On dead branches of Arciostapltylos 

 pungens, Tamalpais, March. 3081. 



Tryblidiella rufula (Spr.) — On dead stems of Rhus di- 

 versiloba, San Francisco, Dec — May. 2578. 



Disk never red. 



Gloniopsis Mulleri (Duby.) — On dead stems of Symphor- 

 icarpas mollis, Sausalito, Aug. 2746. 



Acrospermum graminum Lib. — On grass stems, San Fran- 

 cisco, Jan. 2072. 



Acrospermum corrugatum Ell. — A.fvJtum'Sk. 2500. 



Phacidium pini Schm. — On fallen leaves of Pirius pan- 

 derosa, Blue Canon, June. 3306. 



Rhytisma arbuti Ph. — Spermog. Melasmia arbuticola Vize. 



This fungus is at the present time doing great injury to 

 the Madroiio (Arbutus Menziesii). It appears as a Melasmia 

 in the autumn and very rapidly destroys the vitality of the 

 Avhole or a great part of the affected leaf, which becomes 

 brown and somewhat shriveled. In February the Rhytisma 

 appears on the spot of the original infection, and while the 

 leaf in many cases still partly green remains upon the tree. 



