93. Pyrenopsis ] 26. PYRENOPSIDACEAE 145 



3. Polychidium albociliatum (Desm.) Zahlbr., in E. & P., Nat. Pfl. 1:157. 1907. 



Leptogium albociliatum Desm., Ann. Sci. Nat. Bot. IV. 4:132. 1855. 



Transforming the algal colony into a middle-sized, irregularly lobed, greenish to 

 blackish brown body, the lobes cut, crisped and crenate, bearing minute whitish 

 marginal cilia, sometimes minutely granulose toward the center; lighter below 

 with a more or less fleecy nap; apothecia small to middle-sized, 0.5-1.2 mm. 

 across, sessile, scattered, the disk reddish brown, flat to convex, the proper exciple 

 thin, scarcely lighter than the disk, soon disappearing; spores oblong-ellipsoid to 

 ellipsoid, 18-26 X 6-9 //.. 



On moss, Florida, California, and Oregon. 



92. Porocyphus Koerb., Syst. Lich. 425, 426. 1855. 



Thallus crustose, granulose or minutely branched, rudimentary, devoid of dif- 

 ferentiation into layers; apothecia minute to small, immersed to adnate or sessile, 

 the disk closed to open, concave, the exciple colored like the disk, indistinct, sur- 

 rounded by a thicker, more or less irregular, thalloid one; hypothecium and hy- 

 menium hyaline; paraphyses threadlike, unbranched and free; asci cylindrico- 

 clavate; spores 8, hyaline, ellipsoid to ovoid-ellipsoid, non-septate. 



The algal host is Scytonema. 



1. Porocyphus furfurellus (Nyl.) Forss., Nov. Act. Reg. Soc. Sci. Ups. III. 

 13:87. 1885. 

 Collema furfurellitm Nyl., Not. Sallsk. Faun. Flor. Fenn. 1:229. 1858. Pyre- 

 nopsis corallina Willey. 

 Thallus thin, subareolate, composed of dark olive to brownish black, branched, 

 coralloid granules; apothecia minute, 0.15-0.3 mm. across, sessile, the disk con- 

 cave, brownish black, the exciple thick, colored like the thallus, finally crenulate; 

 spores ellipsoid, 12-20 X 6-10 /x, uniseriately to irregularly arranged. 

 On rocks, Vermont, New Hampshire, Massachusetts, and Colorado. 



26. PYRENOPSIDACEAE 



Thallus crustose, foliose or fruticose, showing little or no differentiation into 

 layers, attached to the substratum by hyphal rhizoids, rhizoids, or an umbilicus; 

 apothecia commonly superficial, rarely somewhat immersed, with a proper or 

 thalloid exciple. 



The algal hosts are Gloeocapsa, Chroococcus, and Xanthocapsa. 



A. Thallus crustose to squamulose 



B. Apothecia with proper and thalloid exciples 95. Psorotichia 



B. Apothecia with thalloid exciple 



C. Spores 8 in an ascus 93. Pyrenopsis 



C. Spores many in an ascus 96. Forssellia 



A. Thallus foliose to fruticose 



B. Thallus attached to the substratum only at the center .... 97. Thyrea 

 B. Thallus not attached to the substratum only at 

 the center 

 C. Thallus more or less branched; apothecia small to 



middle-sized 98. Peccania 



C. Thallus much branched; apothecia minute to small ... 94. Synalissa 



93. Pyrenopsis Nyl., Mem. Soc. Sci. Nat. Cherb. 5:143. 1857. 



Thallus crustose, granulose, minutely warty, or with minute coralloid branches, 

 devoid of differentiation into layers, attached to the substratum by hyphal rhi- 

 zoids; apothecia minute to small, immersed to adnate, the disk more or less closed 

 to open, concave to flat or convex, the exciple colored like the thallus; hypothe- 

 cium hyaline to brownish; hymenium hyaline or brownish above; paraphyses more 

 or less distinct, unbranched; asci clavate to cylindrico-clavate; spores commonly 



