PLATE IV. 



FIG. I. Limacinia ? alaskensis Sacc. & Seal, a, fungus, X l > ^> c > hyphse ; </, 

 conidium ; e, perithecia aucta ; _/", asci immaturi. 



2. Hypoxylon ohiense Ell. & Everh. , fungus sectus, X l ^ ascus; c, 

 sporidia. 



3. LcEstadia saxifragce Sacc. & Seal, a, fungus, X i ! #> perithecium sec- 

 turn ; c, asci ; </, sporidia. 



4. Physalospora borealis Sacc. & Seal, c, fungus, X I i ^> perithecia 

 aucta ; c, ascus ; d, sporidia. 



5. Sphterella graminum Sacc. & Seal, a, fungus, X I ! ^> perithecium 

 auctum ; <r, asci ; </, sporidia. 



6. Sphcerella gros$ulari<z salicella Sacc. & Seal, a, fungus, X J ! ^> 

 perithecium auctum; c, ascus; </, sporidia. (In folio salicino adest 

 quoque Rhytisma sah'ctnum.) 



7. Sphczrella leptospora Sacc. & Seal, a, fungus, X J 5 ^ perithecium 

 auctum ; c, asci ; </, sporidia. 



8. Venturia kunzei ranricola Sacc. & Seal. , fungus, X l ; ^ perithecia 

 aucta; c, setula perithecii ; <f, ascus; e, sporidia. 



9. Didymosphceria arenaria macrospora Sacc. & Seal. , fungus, X ' 

 b, perithecium auctum ; c, ascus ; d, sporidia. 



(58) 



