REPORT OF THE STATE BOTANIST I9IO 47 



Oidium destruens Pk. 

 This destructive parasitic fungus begins its work early in the 

 season. Young leaves of the shad bush Amelanchier 

 oblongi folia (T. & G.) Roem. were found near Albany 

 affected by it the last week in April. 



Parmelia borreri hypomela Tuck. 

 Bark of red cedar, Juniper us virginiana L. Orient 

 Point. April. R. Latham. 



Parmelia perforata hypotropa Nyl. 



Bark of red cedar, J u n i p e r u s virginiana L. Orient 

 Point. April. R. Latham. 



Peronospora ficariae Tul. 



Living leaves of buttercup. Ranunculus acris L. Me- 

 nands. May. 



Plantago media L. 

 Near Canandaigua. August. Miss E. C. Webster. This intro- 

 duced plantain is rare. 'Its spikes resemble those of the English 

 plantain but it is easily distinguished from that species by the broad, 

 hoary pubescent leaves. 



Polypodium vulgare L. 



A singular small sterile fern which, on account of its venation 

 has been referred to this species, was collected near Lake George 

 and specimens were contributed by C. L. Williams and Mrs S. W. 

 Russell. 



The fronds are 5-12 cm long, 1-2 cm broad, sinuate lobed or 

 irregularly pinnatifid. the lobes being broad, obtuse and unequal. 



Ramalina calicaris fraxinea Fr. 



Orient Point. November. R. Latham. 



Roestelia aurantia'ca Pk. 



The orange colored rust occurs on various species of shad bush, 

 Amelanchier, and of thorn bushes and trees, Crataegus. Also on 

 quince trees. It attacks the leaves, fruit and sometimes the twigs. 

 Its alternate form is Gymnosporangium clavipes 



