Report of the Si ate Botanist , 149 



is sometimes even, sometimes tuberculose and occasionally rimose 

 when dry, as in some species of Corticiiim. The margin may be 

 broad naked and white or it may be obliterated by the hymenium. 

 The subiculum is either thin and papery or thick and firm. It is 

 sometimes separable from the matrix. It occurs on spruce, hem- 

 lock, birch, sycamore, ironwood, etc. A form is found on spruce 

 having the characters of variety areolata Fr. except in the color of 

 the hymenium. 



Var. tuberculosa has the subiculum thick, firm, yelloAvish, the 

 hymenium persistently tuberculose. This was found on sycamore, 

 Platanus occidentalis. 



Yar. rimosa. Hymenium rimose. On hemlock, Tsuga Canadensis. 



Doassantia Alismatis Gornu. 



Living- or languishing leaves of Alisma Plantago. Whitehall. 



September. 



Fusicladium destruens Pk. 



When my last report was written this fungus was suspected of 

 being the cause of a disease in the oat pla«it. Observations made 

 in the diseased oat fields the past summer lead to a different con- 

 clusion. The disease has appeared over a wide extent of country, 

 and in the fields examined scarcely an unaffected plant could be found. 

 Besides, other fungi, such as Gladosporium herbarum and Dinemas- 

 porium graminum, were found upon the dead and dying leaves. It 

 may be affirmed that the presence of these fungi on the leaves is a 

 consequence not a cause of their death, for these species are known 

 to inhabit thq dead tissues of plants. It is hardly probable that the 

 Fusicladium could have spread so extensively, in so short a time, 

 nor that it should be so omnipresent in every oatfield. It is more 

 reasonable to suppose that it, like the other fungi mentioned, is a 

 consequence rather than a cause of the disease. Many discolored 

 leaves had no fungus upon them. An examination of the roots of 

 the affected plants gave no indication of the presence of insects or 

 nematoids. 



Tuberculina persicina Sacc. 



On blackberry rust, Cceoma nitens. Morehouseville. 



Vibrissea truncorum Fr. 



Yar. albipes. Stem short, thick, white. Decaying wood about 

 the margin of lakes. Hewitt's pond and Clear lake, Adirondack 

 mountains. July. 



