2. 0. (leildritica, Ach. On trees, especially white pine. Com¬ 
mon. 
b. inusta, Ach., Nyl. The most common form, 
r. medusa la, Nvl. Rare. 
It is here, leaving his account of this Genus, so rich in new and 
difficult forms in the Southern States, unfinished in the Synopsis, 
that we part company with the illustrious botanist who devoted his 
life to American lichens. And here I would pay a last tribute to the 
memory of one to whom, for the unbounded liberality of the infor¬ 
mation imparted from 1S62 to the time of his death, and for his pa¬ 
tience under my sometimes too great demands upon him, I am under 
such great obligations. The friend and correspondent of Elias Fries, 
Camille Montagne, and other distinguished European botanists of 
his day, as well as of Austin, Frost, Hall, Hayden, Peters, Ravenel. 
Russell, Wright, and others, his collaborators in this country, all 
honorable gentlemen, whose names will ever be associated with the 
golden age of American lichenology, Edward Tuckerman, if he had 
not the extensive knowledge of species possessed by some European 
lichenists. and if he was perhaps too reluctant to admit generic and 
specific differences, was surpassed by none of them in his disinter¬ 
ested love of truth, in the patience with which he sought to unravel 
the difficulties of the most difficult of all plants, and in the philo¬ 
sophic spirit with which he labored to trace their affinities and to 
bring them into natural connection. 
In passing, it maybe observed that according to Nyl., Japan, p. 
108, Grapkis scolecitis, Tuck., Syn. II, p. 125, is the same as G. 
adscribens, Nyl. Syn . JVov. Caled., p. 78. 
42. 0PEGRAPH4, (Humb.) Ach., Nyl. 
1. 0. (lemissa, Tuck., Gen., p, 199. On various barks, Rhus 
venenata, 1S70, R. copallina, wild cherry, holly, witch hazel, and 
ash. In examining the apoth. of this species I have observed, lining 
the inner walls of the exciple, certain compact cells, .007-9 mm. long, 
but could detect nothing like stylospores or spermatia. I do not 
know in what light they are to be viewed. 
2. 0. levidensis. Willey. Thallus inconspicuous. Apoth. black, 
minute, sessile, rounded or oblong, with a thin connivent margin. 
Spores ovoid, bilocular, the upper cell wider, without color, .012-16 
bv .006-7 mm. Reaction with iodine blue. On rail, 1872. Only 
found once. 
