94 Bulletin 313 



Septoria rhoina B. & C. — On leaves of Rhus copallina. Causes 

 spots. Spots reddish brown, circular, ovate, sometimes confluent; 

 pycnidia nimierous, black on both surfaces of the leaf ; spores long, 

 slender, flexuose, few septate, 50-86.5 x 3.3-6.3 fx. 



557. Infected leaflet of Rhus copallina. 558. Spores, 1/12. 



Septoria rubi West. — On the leaves and stems of the species of 

 Rubus. Causes small, circular, reddish-brown spots which become 

 white with purple borders ; pycnidia sparse, curved, brownish-black, 

 depressed, erumpent; spores filiform, hyaline, 2-3 septate, 40-55 x 

 1.5 /It. 



559. Infected leaflet of raspberry. 560. Spores, 1/12. 



Septoria vereasicola B. & C. — On the leaves of Verhascum blat- 

 taria L. Causes more or less circular, dry thin spots with broad, 

 dark, purple borders and about 1-3 mm. in diameter, Pycnidia few 

 on a spot, clustered, black, erumpent, 80-85 fi; spores hyaline, fili- 

 form, curved, 20-40 x 1.5 /t. 



561. Infected leaf of V. blattaria. 562. Pycnidia, 2/3. 563. Spores, 1/12. 



Melasmia acerina Lev. (= Rhytisma acerinum (Pers.) Fr., 

 page 24). 



Entomosporium maculatum Lev. (FabrcBa macidata (Lev.) Atk., 

 page 24). — On leaf and fruit of the pear and quince. Causes spots 

 which are more prominent on the upper surface, circular, at first 

 reddish with dark borders, in severe cases causing the leaves to be- 

 come brown and fall ; fruit spots are red, gradually becoming very 

 black, and in severe cases cause the fruit to crack. Acervuli, black, 

 sub-epidermal ; conidia hyaline, 18-20 s. 12 fx, 4 cells in a group, stipe 

 filiform, 20 x 0.75 /x, the other cells with long setse. 



564. Infected leaf of pear. 565. Infected fruit of pear. 566. Infected Icrf 

 of fuince. 567. Cross-section of acervulus, 2/3. 568. Hymenium showinq; 

 formation of conidia, 1/12. 569. Mature spores, 1/12. 



Entomosporium thumenii (Cke.) Sacc. — Causes small, dark, 

 spots on the leaves of Crataegus oxyacantha. Probably the sam.e as 

 E. Maculahtm Acervuli numerous, on both surfaces of the leaf, 

 flattened, orbicular, roughened, often confluent, conidia 22 x 9 /i. 



570- Infected leaf of Cratagus sp. 571. Mature spores, 1/12. 



DiscosiA ARTOCREAS (Tode) Fr.^ — On the canes of the raspberry; 

 associated with the Coniothyrium fuckelii cankers. Pycnirlia 

 grouped, disc-shaped, black, shining, at first convex becoming de- 

 pressed and ostiolate and finally collapsing; spores elongated, very 

 slightly curved, ends rounded, 3-septate. hyaline or yellowish, a 



