BOTANICAL GAZETTE. 313 



8. P. gangliformis (Berk.) De Bary. 



Botrytis ganglioniformis Berk. Lond. Jour. Hort. Soe. I. 51. PI. 4. 

 P. aanqlioniformis Tul. Compt. Rend. XXXVIII, 26. 



P. gam/liformiH De Barv 1. c. PI. VIII. f. 1-3 ; Bull. Buss. Inst. I. 427 ; Cat. Pacif. 

 Fung. p. 29. Bull. 111. Mus. I. p. 551, pi. II. 3. 

 Exs. Ellis N. Am. Fung, 219 



Mycelium with ovate haustoria. Conidiophores simple be- 

 low, slender, becoming several times dichotomous, the divisions 

 often recurved, swelling at the tip into clavate or cup-shaped 

 bodies from which radiate several sterigmata. Conidia small, 

 globose or ellipsoidal, 16-23 !>■ by 16-20 p-. Oospores yellowish, 

 thin walled, 26-34 // in diameter. Exospore smooth. 



On Nabqlus aUms (oospores), Lactuca altissima, L. Canadensis, L. saliva, and 

 Mulgedium leucophceum. 



New Hampshire, Mass., New York (Farlow), Iowa (Bessey), Illinois (Bur- 

 rill), to Wisconsin (Trelease). Europe. 



A species easily recognized by the swollen or cup-shaped tips from which 

 radiate a few sterigmata. It does considerable harm near Boston and New 

 York to early lettuce raised in hot-beds. I have seen oospores on Nabalus albus 

 only. The species is apparently common with us and will be found on several 

 other hosts than those mentioned above. It has not yet been seen in this coun- 

 try on Senecio vulgaris on which it produces oospores in Europe. 



Section V. Pleuroblast.e. Conidia white or violet colored, (termina- 

 tion by tubes given off from any part of the conidia, but especially the sides. 

 Ramification dichotomous. 



A. Parasitical. Wall of oogonium thick and rigid. Oospores with a thin, 

 smooth exospore. 



9. P. PARASITICA (P.) Tul. 



Botrytis parasitica Persoon Opserv, I. 96. 



P. parasitica Tul. Compt. Rend. ; De Bary 1. c. p. 106, PI. IX. f. 5-8; Bull. Buss. 



Inst. I. 42S; 26th Kept. N. Y. Bot. p. 79; Cat. Pacif. Fung. p. 29. 

 P. Dentarise Rabh. Fung. Eur. 86. 

 Exs. Ellis, N. Am. Fung. 212. 



Mycelium large, with very large clavate or branching root- 

 like haustoria. Conidiophores stout and simple below, branch- 

 ing above, rather abruptly and irregularly dichotomous, the 

 divisions dense, slender and flexuous. Tips subulate, curved. 

 Conidia white, broadly ellipsoidal. Oospores 26-43 fi in diam- 

 eter. Exospore brown and nearly smooth. 



In Capsella Bursa-pastoris, Lepidium Virginicum, Brassica satica, Rhaphamts 

 sativus, Cardamine rhomboidea, and Dentaria laciniata. Oospores on Cardamine and 

 Dentaria. 



Mass. (Farlow), New York (Peck), to Delaware (Farlow), North Carolina 

 (Curtis) and west to Wisconsin (Trelease), Kentucky (Kellerman) and Califor- 

 nia (Harkness). Europe. 



A common species on Cruciferce in all parts of the country, often in com- 

 pany with Oystopm Candidas, on which it was once believed to be parasitic. It 

 occasionally causes considerable damage to the cabbage crop. On Lepidium 

 and Capsella it covers the under surface of the leaves with a dense fleece, but on 



