178 31. STICTACEAE [114. Coccocarpia 



brown to brown, the exciple thin, prominent, crenate and becoming granulose; 

 spores ovoid-ellipsoid, 16-23 X 7-11 /x. 



On soil among mosses, New Hampshire, from Montana to Washington, and 

 southward to New Mexico. 



114. Coccocarpia Pers., in Gaud., Voy. Uran. Bot. 206. 1826. 



Thallus foliose or squamulose, smooth to rough, more or less lobed, differen- 

 tiated into a well-developed, plectenchymatous upper cortex of longitudinally ex- 

 tending hyphae, an algal layer, and a more or less well-developed medullary layer 

 passing into the plectenchymatous lower cortex of longitudinally extending hyphae; 

 more or less densely clothed below with bluish black rhizoids; apothecia minute 

 to small or larger, adnate, the disk flat to convex, the exciple colored like the disk, 

 disappearing; hypothecium hyaline to brownish; hymenium hyaline or brownish 

 above; paraphyses unbranched; asci clavate; spores 8, hyaline, ellipsoid to oblong- 

 ellipsoid or spindle-shaped, non-septate. 



The algal host is Scytonema. 

 A. Thallus smooth or bearing coralloid branchlets, the lobes entire . . 2. C.pellita 

 A. Thallus covered with minute coralloid branchlets, the 



lobes irregularly incised 1- C. incisa 



1. Coccocarpia incisa Pers., in Gaud., Voy. Uran. Bot. 206. 1826. 



C.molybdaea var. incisa (Pers.) Nyl. Pannaria molybdaea var. incisa (Pers.) 

 Tuck. C. pellita var. incisa (Pers.) Mull. Arg. C. cronia (Tuck.) Vainio. 



Thallus small to middle-sized, smooth to rough and covered with minute coral- 

 loid branchlets, irregularly lobed, grayish to lead-colored or greenish gray ; whitish 

 to brownish below and densely covered with bluish black rhizoids; apothecia mi- 

 nute to small, 0.4-0.8 mm. across, adnate, sometimes white-fibrillose below, the 

 disk convex, reddish brown to black, the exciple colored like the disk, soon dis- 

 appearing; hypothecium hyaline; spores ellipsoid to oblong-ellipsoid, 8-13X3.5- 

 6.5 ix. 



On trees, from New England to Florida, and westward to Illinois and Texas. 



2. Coccocarpia pellita (Ach.) Mull. Arg., Flora 65:326. 1882. 



Parmelia pellita Ach., Lich. Univ. 468. 1810. Pannaria molybdaea (Pers.) Tuck. 

 C. pellita var. cocoes (Fee) Zahlbr. 



Thallus medium-sized or larger, grayish lead-colored to light greenish gray, 

 smooth above or bearing coralloid branchlets; heavily clothed below with bluish 

 black rhizoids, or rarely in part naked and whitish; apothecia small to middle- 

 sized, 0.5-1 mm. across, closely adnate, the disk yellowish brown to dull black, 

 the exciple colored like the thallus and soon disappearing; hypothecium hyaline 

 to yellowish; spores oblong-ellipsoid, 9-14 X 3-5 /a. 



On trees, from Massachusetts to Florida, and westward to Illinois and Texas. 



31. STICTACEAE 



Thallus distinctly foliose, more or less lobed at the margin, loosely attached to 

 the substratum, differentiated into well-developed upper and lower cortices, algal and 

 medullary layers, the lower cortex more or less discontinued and interspersed with 

 cyphellae; apothecia round, scattered or marginal, superficial, with a proper or 

 thalloid exciple. 



The algal hosts are Palmella, Protococcus, and Nostoc. 



115. Sticta Schreb., Gener. Plant. 768. 1791. 



Thallus foliose, small to middle-sized or large, smooth to wrinkled, more or less 

 lobed, rather loosely attached to the substratum by short or long rhizoids, differ- 

 entiated into a thick, well-developed, plectenchymatous upper cortex, distinct 



