64 



This species is closely related to R. Armoraciae, from which it 

 may be distinguished by the whiter mostly margined spots, the 

 shorter hyphae and the catenulate spores. 



CONIOSPORIUM PUNCTOIDEUM, Karst. 



Decorticated wood of arbor vitae, Thuja occidentalis. Adirondack 

 mountains. June. 



CLADOSPORIUM APHIDES, Thum. 



Dead aphides of Phragmites communis. Bergen Swamp. June. 

 CLADOSPORIUM ASPARAGI, Fr. 



Dead stems of asparagus. Menands. October. 

 CLADOSPORIUM BREVIPES, N. sp. 



Spots suborbicular, cinereous; flocci densely caespitose, short, 

 .001 to .0015 inch long, dark olivaceous, almost black in the mass, 

 amphigenous, septate; spores terminal, elliptical, .0005 to .0006 

 inch long, .0003 to .0004 broad. 



Living leaves of white oak, Quercus alba. Menands. July. 

 This species forms minute compact tufts, so distinct and well 

 defined that they might easily be mistaken for perithecia. 



CLADOSPORIUM LETIFERUM, N. sp. 



Spots dark brown, irregular, large, often involving the whole 

 leaf; tufts epiphyllous, subeffused, olive green, the hyphae very 

 short, almost obsolete; spores oblong-pyriform, uniseptate or 

 biseptate, slightly constricted at the septa, .oooS to .0012 inch 

 long, .0003 broad. 



Living leaves of poplar, Popitlus tremuloides. Keene. June. 



This fungus often kills the leaves it attacks. When the spores 

 have a single septuin the two cells are unequal; when they have 

 two septa the middle cell is generally larger than the terminal 

 ones. The species differs from C. Asteroma in the shape ^nd char- 

 acter of the spores and in its more effused habit." 



CERCOSPORA ACETOSELL^, ElUs. 



Living leaves of yellow dock, Rwnex crispus. Elizabethtown. 

 September. 



Our specimens differ slightly from the type and may be designated 

 variety maculosa. Spots numerous, small, suborbicular, grayish, 



