July 1907] Index to North American Mycology IBS' 



Ravenelia mimosae-albidae Diet. n. sp., on Mimosa albida H. et 

 B., and M. albida var. floribunda Rob. [Mexico.] Beihefte 

 z. Bot. Centrbl. 20 :yj'^. 1906. 



Ravenelia mimosae-caeruleae Diet. n. sp., on Mimosa caerulea 

 Rose. [Mexico.] Beihefte z. Bot. Centrbl. 20:378. 1906. 



Ravenelia, Notes on New or Rare Species. W. H. Long. Jour. 

 Mycol. 12:234-6. Nov. 1906. 



Ravenelia piscidiae Long n. sp., on Piscidia erythrina. Jour. 

 Mycol. 12:234. Nov. 1906. 



Ray Blight, A New Chrysanthemum Disease. [Abstract.] F. 

 L. Stevens. Science N. S. 25:291. 22 Feb, 1907. 



Reasons for desiring a, see Better Classification of the Uredi- 

 nales. . . . 



Rehm, H. Ascomycetes Americae borealis. Ann. Mycolog. 

 3:516-520. Dec. 1905. 



Report of the Botanist 1905. Charles H. Peck. N. Y, State 

 Mus. Bull. 105 (Bot. 9) :4-io6. PI. S. T. 94-103. Aug. 1906. 



Rhizopus nigricans, Zygospores and sexual Strains in the com- 

 mon Bread Mould. A. F. Blakeslee. Science N. S. 24:118- 

 122. 27 July 1906. 



Rice Plant, Pathology of. [Abstract.] Haven Metcalf. Science 

 N. S. 25 :262. 15 Feb. 1907. 



RuBus sp., host to Spirechina loeseneriana (P. Henn.) Arth. n. 

 n, [Mexico.] Jour. Mycol. 13:30. Jan, 1907. 



RussuLA subsordida Peck n. sp. N. Y, State Mus. Bull. 

 105 (Bot. 9) :4o. Aug. 1906. 



RussuLA viridella Peck n. sp., grows under Hemlock trees. N. 

 Y. State Mus. Bull. 105 (Bot. 9) :4i. Aug. 1906. 



Rusts of Guatemala. [40 species, 5 new species, localities, notes 

 and descriptions.] Frank D. Kern. Jour. Mycol. 13:18-26. 

 Jan. 1907. 



Salmon, Ernest S. On the Variation shown by the conidial 

 stage of Phyllactinia corvlea (Pers.) Karst. — L Ann. 

 Mycolog. 3:494-505. PI. Xni-XV. Dec. 1905. 



Salvia elegans Vahl., host to Polioma delicatula Arthur n. sp. 

 [Mexico.] Jour. Mycol. 13:29. Jan. 1907. 



Salvia nivea Cav., host to Polioma nivea (Holw.) Arth. n. n. 

 [Mexico.] Jour. Mycol. 13 :29. Jan. 1907. 



ScLEROTiNiA (Stromatinia) seaveri Rehm n. sp., ad putamina 

 Pruni serotinae. Ann. Mycolog. 3:519. Dec. 1905. 



