THE LICHEN FLORA OP THE SANTA CRUZ PENINSULA 145 



A very distinct and handsome lichen, thus far recorded only from 

 central California. 



HEPPIACEJE. 



Thallus varying from very small crustaceous scales or more or 

 less foliaceous squamules to ascendant, branched, sub-fruticose 

 forms; attached by rhizoids or by a central umbilicus; tissue mostly 

 of a large celled pseudoparenchyma; hypothallus well developed or 

 finally disappearing; alga Scytonema. 



Apothecia scattered over the surface, innate, usually invisible to 

 the naked eye, the disk very narrow and pore-like, or occasionally 

 somewhat emergent; proper margin lacking or indistinct; hypothe- 

 cium clear; paraphyses simple, usually septate; asci containing from 

 4 to many spores, these simple, colorless, ellipsoid to spherical, thin 

 walled. 



Comprises but a single genus. 



XXXIV. Heppia Naeg. 



Heppia Naegeli, in Hepp. Exsiccata, no. 49. 1853. 

 Heppia Th. Fries, Gen. Heterol. Europ. 56. 1861. 

 Heppia A. Zahlbr. Ascolichenes, 177. 1907. 

 Characters of the genus as above. 



KEY TO THE SPECIES. 



A. Thallus thick, small-leaved, attached by a central umbilicus, ap- 

 pressed. 



B. Thallus usually with a blue sorediose margin i. guepini 



A A . Thallus not umbilicate; without blue sorediose margin. 



C. Squamules more or less ascendant and containing several apothecia. 



2. bolanderi 



CC. Thallus of small, closely appressed squamules, each containing but 

 one apothecium 3. hassei 



i. HEPPIA GUEPINI (Delise) Nyl. 



Endocarpon guepini Delise, apud Duby et DC. Botanic. Gallic. 2 : 



594. 1830. 



Endocarpon guepini Moug. apud Fr. Lich. Europ. 410. 1831. 

 Heppia guepini Nyl.apud Stizbgr. Lich. Helv. in Jahresb. St. Gal- 



lisch. Naturwiss. Ges. 338. 1882. 



