177. Dictyonema] 45. THELEPHORACEAE 391 



10. Anaptychia leucomela (L.) Mass., Mem. Lich., 35. f. 28. 1853. 



Lichen leucomelas L., Sp. PI. ed. 3. 1613. 1764. Physcia leucomela (L.) Michx. 

 A. leucomelaena Vainio. 



Thallus middle-sized, greenish gray to whitish, fruticose and ascending, long 

 and much branched, the branches linear, entangled, the ends entire to crenate, 

 sometimes recurved and white-sorediate, the margins bearing strong, branched, 

 blackening cilia; white and decorticate below; apothecia middle-sized, 4-6 mm. 

 across, pedicellate, the disk flat, white-pruinose, the exciple lobulate; spores ellip- 

 soid, 35-55 X 16-25 /jl. 



On trees, from New York southward to North Carolina, westward to Louisiana 

 and Ohio, and appearing again in California. 



11. Anaptychia ciliaris (L.) Koerb., in Mass., Mem. Lich. 35. f. 27. 1853. 

 Lichen ciliaris L., Sp. PI. 1144. 1753. Physcia ciliaris (L.) Ach. Physcia ciliaris 



var. crinalis (Torss.) Schaer. 



Thallus fruticose, tufted, ascending or pendant, whitish or brownish, bearing 

 trichomatic hyphae, the lobes convex, elongated, narrow, frequently round, much 

 branched and usually becoming entangled, bearing pale or darkening rhizoids, 

 especially toward the ends; whitish and commonly channeled below; apothecia 

 small to middle-sized, 2-4.5 mm. across, short-pedicellate, the disk more or less 

 concave, the exciple subentire to crenate, or more or less toothed-ciliate; spores 

 oblong-ellipsoid, 30-46 X 15-21 /x. (Plate 47 b.) 



On rocks and soil and rarely on trees, northeastern United States, westward to 

 the Rocky Mountains. 



45. THELEPHORACEAE 



Thallus irregularly spread over the algal host and the substratum or becoming 

 pileate, showing little or no differentiation, closely attached to the substratum at 

 one side or throughout; hymenium on the under side of the thallus, composed of 

 basidia and paraphyses. 



The algal host is Scytonema. 



A. Thallus kidney-shaped or circular 176. Cora 



A. Thallus more or less irregularly spread over the substratum, 



rarely circular 177. Dictyonema 



176. Cora E. Fries, Syst. Orb. Veg. 300. 1825. 



Pileus thin, kidney-shaped or circular in outline, composed of loosely inter- 

 woven hyphae; ventral hymenium forming an irregular, chinky to subareolate 

 layer, composed of cystidia and basidia, each of the latter bearing 4 short sterig- 

 mata; spores borne singly on the tips of the sterigmata, non-septate, hyaline to 

 brownish, spheroidal or somewhat elongated. 



The algal host is Scytonema contained in a definite zone about midway between 

 the dorsal and ventral surfaces of the pileus. 



1. Cora pavonia (Web.) E. Fries, Syst. Orb. Veg. 300. 1825. 



Thelophora pavonia Web., in Web. & Mohr, Beitr. Naturk. 1:236. 1805. 



Pileus kidney-shaped to circular in outline, 10-100 or more mm. across, thin 

 and membranaceous, often more or less overlapping, horizontal or ascending, the 

 margin usually inward-rolled, smooth, concentrically striate, often obscurely 

 wrinkled, grayish white above; pale yellowish, flesh-colored to pale brick-red below; 

 spores 10-15 X 6-12 /x. 



On mossy soil, old wood, and trees, Florida. 



177. Dictyonema Agardh., Kunth. Syn. PI. Aequin. Orb. 



Nov. 1:1. 1822. 



Thallus semicircular and attached at one side to the substratum or forming an 

 uneven layer over the substratum, composed of loosely interwoven hyphae; 



