BOTANICAL GAZETTE. 311 



4. P. Geranii Peck. 



28th Report N. Y. Bot. p. 63. r T ,„„ _ , . , 



P » inn Ung. var. Qeranii Farlow Bull. Buss. Inst. 1.42b: Proc. Am. Acad. 



XVIII. 73. 

 Exs. Ellis N. Am. Fung. 218. 



Mycelium large, with oval haustoria. Conidiophores short 

 and delicate, axis naked below, hearing at the tip a few short 

 horizontal 1 to 2 pinnate branches. Tips long, slender, divergent. 

 Conidia broadly ellipsoidal, 17-23/x by 15-18/*. Oospores 30- 

 40/7. in diameter, exospore yellowish-brown, somewhat rugose. 



On Geranium maculatum (oospores), G. Boberiianum and G. Carolinianum. 



Mass. ( Farlow), New York (Peck), Michigan (Spalding), to Wisconsin 

 (Trelease). 



Found throughout the summer, forming large patches between the princi- 

 pal veins, sometimes almost covering the whole under surface of the leaves and 

 causing yellow discoloratiousof the uppei surface. Hardly to be distinguished 

 from P. nivea. Differing from the preceding members of the section in its 

 shorter main axis, its short and at times very condensed branches with longer 

 spreading tips. 



I have received from Mr. F. S. Earle specimens collected on G. Carolin- 

 ianum, at Cobden, 111., which were very puzzling. The conidiophores were very 

 irregularly branched and scanty, and there were two kinds of conidia, some of 

 the size given above, and others very much larger, in fact, enormous. On ex- 

 amination the large conidia were found to be borne, not on the conidiophores 

 proper, but in the following manner : The mycelium in the leaf made its way 

 to the stoma, but instead of growing upwards and branching it at once ex- 

 panded into one or two enormous conidia which appeared to be resting on a 

 stoma. A similar condition has been described by Cornu in P. viticola, but his 

 figure is not so striking as the specimens from Illinois. The latter were col- 

 lected in April, and a similar condition also exists in P. Violm, collected by Mr. 

 Earle, also in April. It may be that this suppression of the ordinary conidio- 

 phore and the substitution of large si ssile conidia is a common occurrence 

 early in the season. In spite of their abnormal appearance I presume that the 

 specimens on G. Carolinianum from Illinois probably are to be included under 

 P. Geranii, but the scanty conidiophores did not present a typical appearance, 

 but resembled somewhat those of P. ■pusilla Ung. Examination of a larger set 

 of specimens is necessary to settle this form. 



5. P. nivea (Ung.) DeBary. 



Botrytis nivea Unger Exanthem. 171. 



Per. nivea Ung. Bot. Zeit. 1847, in part; DeBary 1. c. 101. PI. IV; Cat, Pacif. 



Fung. 29. 

 Per. Umbeliiferarum Casp. Berlin Acad. Monatsber. 



Haustoria obovate. Conidiophores short, bearing near the 

 apex a few short horizontal 1 to 2 (rarely 3) pinnate branches. 

 Tips subulate, straight, rarely subflexuous. Conidia subglobose, 

 slightly papillate. Oospores large, with a pale yellowish-brown, 

 smooth, or subrugose exospore. 



On Umbcllifene. California (Harkness). Europe. 



