76 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
algal cells, mostly several grouped together; apothecia immersed or the disk at times 
slightly elevated; proper exciple ill developed and a thalline margin often wanting; 
paraphyses slender, jointed, unbranched; asci paucisporous or multisporous; spores 
colorless, globular or ovoid; spermatia ellipsoid to oblong, short. 
HEPPIA Naeg. 
The only genus. Characters of the family. 
KEY TO SPECIES, 
Thallus monophyllous or nearly so. 
Strictly monophyllous. 
Border irregularly lobate-crenate.................2..0- 6. H. hasset. 
Border entire. 
Raised more or less. 
Border thin......................02200202000- lL. H. bolanderi. 
Border thick, grayish granulose................. 2. H. guepini. 
Border not raised. 
Disk large, solitary............2.......2..0005 3. H. terrena. 
Disk quite small, solitary..................... 5. H, leptopholis. 
Thallus submonophyllous. 
Disk large, one to several in squamule..................- 4, H. despreuxii. 
Disk minute, immersed......................20222--0-- 8. H. polyspora. 
Thallus not monophyllous. 
Polyphyllous sterile... .............0.0. 20.0 e cece eee eee 7. H. conchiloba. 
Subfruticulose......... 0... cece eee eee eee cece cece eee 9. H. zahlbruckneri. 
1. Heppia bolanderi (Tuck.) Wain. 
Squamules dark umber brown, dispersed or crowded and imbricated, orbicular 
or sinuate and undulating, from 0.5 to 4 mm. in width, centrally loosely attached to 
the substrate; apothecia imbedded in the thallus, indicated by a minute orifice; 
spores minute and numerous. 
Quite frequent on sand rock in the Santa Monica Range 
2. Heppia guepini (Delise) Nyl. 
Squamules monophyllous, stout, 1.5 to 4 mm. wide, the upper surface brownish 
olive green, undulate or planoconvex, the border turgid, repand, grayish-granulose, 
sinuate, entire or interrupted, beneath light brown, centrally affixed to the substrate; 
apothecia imbedded and rarely seen; asci broadly oblong-ellipsoid; spores minute and 
numerous. 
On various rocks; frequent throughout our district. Eastern and Middle United 
United States; Europe; Australia. 
3. Heppia terrena Nyl.; Hasse, Bull. Torrey Club 24: 445. 1897. 
The mostly dispersed squamules roundish, dark olive green, from 0.75 to 1.5 mm. 
in width, flattish, the border lightly curved upward, attached to the substrate by thick 
hyphe; apothecia one in a squamule, when mature occupying, except a narrow rim, 
nearly the entire surface of squamules, adnate and slightly projecting above the sur- 
rounding thallus; disk circular, flat, red brown when dry, brighter red when moistened, 
0.5 to 0.75 mm. in diameter, a thin thalline wall inclosing the thalamium cup-like 
on the sides and beneath, the thin hypothecium resting almost directly upon the 
substrate; epithecium subentire, yellow; thecium 140 to 160 » high, colorless; 
paraphyses slender, compact, not thickened nor colored at the tips; hypothecium 
almost colorless, 60 4 high; asci 120 » long, 32 » thick, the wall thick, especially the 
hoodlike top inclosing the attenuate apex of the cavity; spores regularly globular, 
numerous, 4 to 4.5 » thick; hymenial gelatine with iodine blue, with KHO a handsome 
purple, except the hypothecium, the epithecium becoming dark brownish purple; 
spermogones not seen. 
