OF ARTS AND SCIENCES: APRIL 12, 1864. 267 



This type of frond (intermediate, apparently, between the foliaceous 

 and the crustaceous) is in fact nearest to the latter, and often most 

 manifestly a modification of it, and its systematic value has, it appears 

 to me, been well subordinated by Dr. Stitzenberger (Beitr. z. Flechten- 

 syst. in loco.) 



Lecanora (Squamai-ia) Hatdeni, sp. nov. : thallo subfoliaceo cras- 

 siusculo coriaceo-cartilagineo lacero-laciniato viridi-stramineo subtus 

 rufo-fuscescente ambitu nigricante, laciniis lobato-divisis margine albo- 



crenulatis convolutis ; apotheciis Upon the earth, Laramie 



plains, Nebraska, Dr. F. V. Hayden. " Covers the ground," says 

 Dr. Hayden, in a letter of 28th December, 1861, "in many parts of 

 the West, especially where there is much gypsum in the soil. In the 

 Laramie plains it covered many square miles, in most places detached 

 and blown about by the wind, sometimes even drifted. It is ft)uud in 

 situ where the ground is moist, where it is most abundant oftentimes ; 

 there is no wood or rocks for it to be attached to." Agreeing in its 

 remarkable history with Lecanora esculenta, (Pall.) Eversm., of the Asi- 

 atic and African deserts, but the thallus of the present (in the larger spe- 

 cimens a little exceeding an inch in the largest diameter) is foliaceous 

 rather than crustaceous. It is, however, thickish, and easily broken, 

 and the plant appears certainly to be comparable rather with L. ru- 

 hina, than with any known form of Parmelia conspersa. The lobes 

 are rolled closely together in all the specimens, and none of them show 

 traces of having been gathered iii situ. A fuller description is reserved, 

 in the hope that other observers may be fortunate enough to detect 

 fertile plants. 



Lecanora (Squamaria) Frostii. Squamaria, Tuckerm. Suppl. I., 

 in Amer. Journ. Sci. 25, p. 425. On granitic rocks, from New Eng- 

 land to Virginia. 



Lecanora subflava, sp. nov.: thallo cartilagineo primitus con- 

 tio'uo l^vigato rimuloso granulatoque luteo hypothallo atro decussato ; 

 apotheciis mediocribus sessilibus disco plano-convexo fulvescente mar- 

 gine thallo subconcolore obtuso integro. Sp. in thecis clavatis incolores, 

 submediocres, ovoideo-ellipsoidcEe, simplices, diam. 1^ - 2° rarius 2^° 

 longiores. Trunks in the island of Cuba, ilir. Wright (Lich. Cub. 

 n. 1G7). Related, in habit and in the spores, rather to L. suhfusca 

 than L. varia. 



