Report of the Botanist. W^ 



siibelliptical, variable, 001'-.0013' long, .0008'-.0009' broad, tlie 

 cells sometimes subdivided. 



Leaves of the dandelion, Taraxacum Dens-leonis. New Balti- 

 more. September to November. Rev. J. L. Zahriskie. 



The remarkable feature of this species is the variable form of the 

 spores ; yet in this character even, it approaches some forms of 

 the next species very closely. It attacks especially the leaves of 

 young or seedling plants. The peduncle is sometimes attached to 

 the side of the spore. I have seen no American specimens with 

 the spore cells subdivided. 



7. P. CoMPosiTARUM Sckl. Composite Brand. 



Amphigenous; spots pallid or none; sori small, subrotund, sur- 

 rounded by the ruptured epidermis, brown; spores .0013 '-.0016' 

 long, .0008'-.00r broad. 



Leaves and stems of Canada thistle, Cirsium arven.se. Common. 

 August to October. 



Variety Ndbali has the spores broadly elliptical or subglobose 

 and generally a little smaller. It occurs on leaves of Nahalus 

 alhus. Trichohasis GiGhoracearxmi Lev. is the Uredo form. 



§ 2. Spores aculeate. 



8. P. AcuLEATA Sckw. Mandrake Brand. 



Hypogenous ; spots large, angular, often confluent, yellow or 

 brown ; sori small, loosely clustered, surrounded by the ruptured 

 epidermis, brown or blackish-brown ; spores elliptical or oblong, 

 obtuse, scarcely constricted, sometimes slightly tapering toward the 

 base, rough with prominent spine-like teeth, .0016' -.0022' long, 

 .0008' -.001' broad ; peduncle very short or indistinct, often want- 

 ing. 



Leaves of mandrake, Podophyllum peltatum. Common. June 

 and July. 



This is the P. Podopliylli of Schweinitz Fungi of North Caro- 

 lina. It sometimes occurs associated with u^cidium Podophylli 

 Schw. 



§ 3. Spores irregular, subelliptical or ovate, generally with a small 

 pustule or apiculus at the apex / peduncle short, easily separating. 



9. P. TETPUSTULATA Pk. BlacJchcrry Brand. 



Hypogenous; spots small, distinct, angular, yellow; sori very 

 minute, few, loosely clustered, brown ; spores triangular, sometimes 

 ovate, not at all or but slightly constricted, mostly tripustulate, 

 .0013'-.0016' long, .0008'-.0009' broad. 



15 



