HASSE—LICHEN FLORA OF SOUTFERN CALIFORNIA. 31 
Spores simple, etc.—Continued. 
Thallus not gelatinous when moist-—Continued. 
Thallus sqamulose or foliose. 
Apothecia affixed by entire under surface... PELTIGERACEAE (p. 82). 
Apothecia sessile or pedicellate. 
Apothecia pedicellate upon podetia...... CLADONIACEAE (p. 57). 
Apothecia not on podetia. 
Medullary hyphz absent or obsoles- 
cent; alge Scytonema............ HEPPIACEAE (p. 75). 
Medullary hyphe present. 
Spores fusiform, several-locular; 
thallus with cyphels............ STICTACEAE (p. 82). 
Spores ovoid to ellipsoid, simple, 
rarely bilocular. 
Gonidia Scytonema alge.......... PANNARIACEAE (p., 79). 
Gonidia Pleurococcus or Palmella 
algee. ; 
Apothecia lecanorine; thallus 
foliaceous.........-..-.---- PARMELIACEAE (p. 99). 
Apothecia not lecanorine, most- 
ly lirellate; thallus mostly 
monophyllous. ............. GYROPHORACEAE (p. 59). 
LECANACTIDACEAE, 
Thallus crustaceous, uniform, with Chroolepus gonidia; apothecia circular, sessile 
or innate, having a distinct or rudimentary proper margin, naked; paraphyses branch- 
ing and more or less reticulate; spores several-locular, colorless, with cylindrical loculi 
and a thin spore membrane; spermatia exobasidial. 
KEY TO GENERA. 
Proper margin wanting or rudimentary; apothecia naked, 
with a lecanorine margin ............-.-2--2-0-0005 ScHIsMATOMMA (p. 32).’ 
Proper margin well developed, black, carbonaceous, con- 
tinuous with the hypothecium.................. LECANACTIS (p. 31). 
LECANACTIS Eschw. 
Thallus crustaceous, uniform, attached to the substrate by the hypothalline or 
medullary hyphe, ecorticate, without rhizins; gonidia Chroolepus; apothecia innate, 
adnate, or sessile, circular, lecideine, with a carbonaceous proper margin, the lecano- 
rine margin absent; hypothecium black, carbonaceous, continuous with the proper 
margin; paraphyses loose, branching, loosely interwoven; asci 4 to 8-spored; spores 
colorless, oblong, fusiform to acicular, parallel-bilocular to multilocular, the loculi 
cylindric; spermatia oblong to cylindric. 
KEY TO SPECIES. 
Apothecia circular, densely pruinose.................----00-- 1. L. salicina. 
Apothecia often oblong or irregular, less densely pruinose....... 2. L. californica. 
1. Lecanactis salicina Zahlbr.; Hasse, Bryologist 11: 7. 1906. 
Thallus, thin, effuse, finely scaly-furfuraceous, silvery gray with at times a faint 
yellowish tinge, KHO—, Ca(ClO),—; epithecium fine-granulose, pale yellowish gray; 
thecium colorless, 70 to 72 » high, staining yellow with iodine; paraphyses lax, loosely 
branching and interwoven; hypothecium dark brown black; asci clavate, nearly 
equaling the thecium in height; spores in 8’s, colorless, fusiform, straight or lightly 
c 
