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2. Spores 4—-pluri—locular. 
A. diffusa, Nyl. in litt, Trunks in the White Mountains (Oakes). —— 
A. lurido-alba, Nyl. in ltt. On dead wood in the White Mountains 
(Oakes). ——.A. astroidea, Ach., Nyl. (Opegr. atrav.macularis, Fr. L. E. 
p. 367; Lich. Suec. n. 24). On bark, very common at the north, and 
found also in North Carolina (Rev. Dr. Curtis). Now curiously suggestive 
of Opegrapha atra. A Texan lichen scarcely otherwise discernible offers 
6-locular spores, measuring 0,018-19™™ long, and 0,003-5™™- wide. —— 
A. mediella, Nyl. (Lich. Scand. p. 259. A. trabinella, Th. Fr. Lich. Arct. 
p. 240 e Nyl.). On dead wood, Greenland (J. Vahl e Th. Fr. 1. c.)—— 
. ramosula, Nyl. (Prodr. Gail. p. 167). North America, Nyl. Enum. 
Gén. suppl.). —— A. orytera, Nv1. (in Prodr. Fl. N. Gran. p. 105, ”.). On 
bark, Tampico, Mexico, Nyl. 1. e. ——-A. atrata (Fée) Nyl. Exp. N. Caled. 
(A. substellata, Nyl. N. Gran. p. 106, fide ipsius). On bark, southern 
Texas (Mr. Ravenel). A. polymorpha, Ach. (Nyl. in Prodr. Fl. N. Gran. 
p. 105, & in Herb. Lindig nu. 2603). On Bald Cypress; South Carolina 
(Mr. Ravenel). Not unlike specimens of A. spectabilis (the 4. polymorpha, 
with scarcely any doubt, of Muhl. Catal. ; as it is also the Opegr. poly- 
morpha of the present writer’s Syn. N. Eng. p. 76) but with small, oblong- 
ovoid, quadrilocular spores. ——.4. complanata, Fée (Nyl. N. Gran. p. 106, 
& in herb, Lindig n. 760). Trunks, South Carolina (Mr. Ravenel) and 
Alabama (Mr. Peters). —— A. pinguis, H. Willey msc. On the young bark 
of White Pine, and observed also on other bark, Weymouth, and New 
Bedford, Mass. (Mr. Willey). Spores fusiform, 8-locular.——<A. platy- 
graphidea, Nyl. (in Prodr. Fl. N. Gran. p. 104, n.). On bark, Tampico, 
Mexico, Nyl. 1. c. 
3. Spores muriform-multilocular. 
A. interveniens, Nyl. (Ll. ¢. p. 104, n.). On Tilia, &c., South Carolina 
(Mr. Ravenel). —— A. tediosa, Nyl. (1. ¢. p. 186). On Holly, and Wax- 
myrtle, South Carolina (Mr. Ravenel). On Red Maple, New Bedford 
(Mr. Willey). ——A. macrotheca, Fée (Suppl. p. 42, t.40). Trunks, south- 
ern Texas (Mr. Ravenel). Spores in sixes and eights, fuscescent or 
decolorate, ovoid-ellipsoid, 0,050-0,069™™- long, and 0,018-0,023™™- wide. 
Better comparable with A. mesoleuca, Nyl. (Vv. Gran. p. 104, n.) a Mexican 
lichen, as this is described, than with Lindig’s specimen of the present 
(herb. N. Gran. n. 732) except in the larger spores. My plant is very 
near to the species next following. ——.4. spectabilis, Flot. (Arthothelium, 
Mass. Rabenh. Lich. Eur. n. 418). On various barks, not unfrequent 
from New England to Virginia. Ohio(Lea). South Carolina (Mr. Ravenel). 
Spores fuscescent or more often decolorate, ovoid-ellipsoid, 0,024-0,037"™- 
long, and 0,011-0,018™™- wide. 
