140 



Phila. Acad., 1876, xxviii, 110-112. (3). How Plants Behave. New York, 

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Henslow, Geo. : On the Self-Fertilization of Plants, {Trans. Linn. Soc, 1877, 2 



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{Bot. Zeilwtg, 1867, XXV, 65-7). 



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1876, xxviii, lo8-ii2). 



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 atology. London, 1869, p. 334). 



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135. A New North American Lichen. 



By H. WiLLEY. 



Mr C. G. Pringle, who in the past two years has added to our 

 knowledge of the Lichen Flora of Northern New England and Lower 

 Canada, last spring collected in Arizona, some lichens, among which 

 there is one that is new and particularly interesting. 



A 1 ? ^T. ^'^^u^"', ^°^''" inspection of the specimen of which I am in- 

 debted to Charles J. Sprague, Esq., of Boston, was collected in the 

 banta Rita Mountains. Arizona. It belongs to the genus Omphalo^ 

 drum and is considered by Prof. Tuckerman to be a subspecies of O. 

 Hottaitottum, (Thunb.), and is to be distinguished as 



a Zr^//.,;/^///m, var. Arizonicum, Tuck., ined. The genus be- 

 longs to the family Umbilicariae, and is distinguished from Umbili- 



Tt? v.} ^ ""J^^?^ "'^'■S^'' °f ^^^ apothecia, on which account O. 

 Mottentottmn and the only other species, O. Pisacomense, May & Fl., 

 a South American lichen, are referred by Nylander to Parmelia. 

 a. Hottentoftum is a rather rare Cape of Good Hope lichen marked 

 by the cihate margins of the thallus and' of the apothecia ; though 

 this character is not constant. ' 



• ^l^^: Arizonicujn the lobes are more rounded and crenate than 

 in Hottentotttim; x\,^ upper side is smooth and greenish-glaucescent, 

 rnmin". ?' . ^^scous-black, naked, smooth at the cenUe, and be- 

 ThT^L r"-^ '"" anastomosing ridges towards the circumference. 

 The apothecia are niimerous, scattered, at first concave, then plane 



^eaLn" omrin'H"'"^^' more slightly crenulate thallin: m^Jn; 

 reachmg 9mm. in diameter; the disk dark chestnut ; the hymenium 

 which rests in the gonidial stratum, is pale ; thekes inflated snorTs 

 m 8s ovoid or elliptical, colorless measuring from 11 to i.-fhou 

 sandths of a millimetre in length and from 6%o 9 in breadth The 

 spermogones are numerous near the margin of the' lobes, mack mo e 



