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tose. The underside is usually tomentose or slightly villous, sometimes 

 there are short rhizoids, but no veining. The apothecia are large, reniform 

 or kidney vShaped, they are borne on tlie underside of the lobes, which in 

 fruiting specimens are elongated and turn over onto the upper side of the 

 thallus. The apothecia are innate with a thin margin which soon disappears ; 

 the disk is a reddish brown. 



Nephroma arcticum (L.) Fr. Thallus usually large and smooth, with 

 rounded lobes, the edges of which are folded or rolled over onto the upper 

 side ; when fresh it it straw-colored with a greenish shade, when dry it is a 

 decided straw color. On the under side the margin of the thallus is an 

 apricot color, soon turning almost black, it is covered, except at the margin, 

 with a short, thick, nap of interlaced fibrils. The apothecia are not frequent, 

 they are large, and affixed to the lobes of the lower side of the thallus : the 

 disk is an orange red. 



N. arcticum, as its specific name indicates, is an arctic species, and is 

 found on rocks with moss or on trunks of trees, sometimes on earth, growing 

 with moss. Prof, Peck, the State Botanist of New York, collected this 

 species on Pitchoff Mountain in the Adirondacks : so far this is the only 

 known station in the State. 



Fig. I. A^, tomentosmn. 

 Nephroma tomentosum (Hoff. ) Koerb. Fig. i. Thallus quite large, in 

 some specimens very large, with rounded lobes, the margins of which are 

 wavy, and usually more or less tomentose. The color is glaucous or green- 

 ish brown, becoming lead color or dark russet. The under side is paler, 

 usually somewhat tomentose, and covered with groups of minute, smooth, 

 pale tubercles, toward the center are short, stiff fibrils b}^ which it is 



