268 M. C. COOKE, NOTES ON PODISOMA. 



3. PODISOMA FUSCUM, Duly. 



Spermogonta — Spermatia cylindrical. 



Peridi A=R(tstella cancellata. Reb. 

 On lea v es of Pear, Apple, &c. 



Protospores— Elliptical, narrowed at each extremity, uniseptate, constricted. 



Teleutospores — Elliptical, or subcymbiform. 

 On living Junipers. 



4. PODISOMA MACROPUS, Schwz. 



Spermogonia 7 tt l ^ 



Per.dia $ Unknown. 



Protospores -Broadly lanceolate, uniseptate, constricted. 

 Teleutospores - Obovate. 



On living Junijjerus Virginiana. 



Species Doubtful. 



Podisoma fuscum. Gasparrini. 

 Podisoma callunse. Opiz. 



Species Excluded. 



Podisoma foliicolum. B. & Br. — Sarcostroma Berkeleyi. CooTce. 

 Podisoma Bulliardi. Bon. = Coryneum or Sarcostroma. 



DESCRIPTION OF PLATES XVIII. and XIX. 



Plate XVIII. 



Fig. 1. — Portion of Podisoma Juniperi with the protospores germinating. 



Fig. 2.— Protospores of Podisoma gymnosporangium. 



Fig. 3. — Protospores of Podisoma gymnosporangium. var. clavipes. C & P. 



Plate XIX. 



Fig. 1.— Protospores of Podisoma Juniperi. 

 Fig. 2. — Protospores of Podisoma fuscum. 

 Fig. 3. — Protospores of Podisoma macropus. 

 Fig. 4. — Fructification of Sarcostroma Berkeleyi. 



