HASSE—LICHEN FLORA OF SOUTHERN CALIFORNIA. 79 
PANNARIACEAE. 
Thallus from semicrustaceous to squamulose and subfoliaceous, corticate above, 
beneath with or without a cortex; medullary layer mostly well developed, containing 
Nostoc, Scytonema, or rarely Pleurococcus gonidia; hypothallus and rhizine distinct; 
apothecia circular, lecanorine or biatorine; paraphyses not branched; asci with 8 
colorless, simple, rarely parallel, 3 to 5-locular spores, their membrane thin and desti- 
tute of a gelatinous halo; sterigma articulate; spermatia short, straight. 
Thallus in ours with blue green Nostoc or Scytonema gonidia; cortex of upper 
surface distinct. 
KEY TO GENERA. 
Apothecia lecanorine. 
Thallus with Nostoc gonidia.......................-.---- PANNARIA (p. 81). 
Thallus with Scytonema gonidia......................... MASSALONGIA (p. 81). 
Apothecia biatorine or lecideine. 
Spores simple................-5..02.-0.20 00200 c eee eee .. PARMELIELLA (p. 79). 
Spores parallel 2 or more locular.................--..--.- PLACYNTHIUM (p. 80). 
PARMELIELLA Muell. Arg. 
Thallus squamulose, lobed at the periphery or almost, foliaceous, attached to the 
substrate by a distinct hypothallus or by rhizin:e; gonidia Nostoc; apothecia bia- 
torine, the excipulum without gonidia; asci 8-spored, spores colorless, simple, oblong 
to ellipsoid, 
KEY TO SPECIES. ~ 
~ 
Thallus lobed, the lobes linear and cleft..... vate caps c ene Cenaaee 4. P. sonomensis, 
Thallus not lobed, squamulose. ‘ \ 
Squamules not imbricated; apothecia rare, minute............ 1. P. ruderatulay 
Squamules imbricated more or less flosely. 
Yellowish gray 10.22.2200... 000 e eee eee eee ee eee ....--. 2, P. microphylia. 
Greenish gray to brownish ./...................--.-.-.- 3. P. lepidota. 
1, Parmeliella ruderatula (Nyl.). 
Pannularia ruderatula Ny1.; Hasse, Lich, South. Calif, 10. 1898. 
Thallus of minute, cervine brown, squamulose scales, these from 0.5 to 1 mm. wide 
and about 0.25 mm. thick, when dry concave and the border connivent, when mois- 
tened flat, imbricated, the border minutely crenulate-globular; section of squamule 
showing above a layer of flattened, hyaline cells, 4 to 6 » thick, resting upon a double 
or triple layer of rounded-quadrangular cells, 10 to 12 thick, beneath this the gonidial 
layer of blue green Nostoc cells, 4 to 8 » thick, and below the medullary layer of smaller 
colorless cells 6 to 8 » thick; hypothallus formed of similar dingy brownish cells; 
apothecia biatorine, sessile, 1 mm. wide and almost entirely covering the squamule, 
the disk flat, dark purple brown with an entire, lighter colored margin; epithecium 
subcontinuous, light yellowish brown, gradually paling downward; thecium 112 to 
120 p» high, the lower two-thirds colorless; paraphyses stout, 2 to 3 thick, faintly 
septate, the slightly clavate tips light brown, some forking above; hypothecium pale 
straw color: asci inflated-clavate; spores 8, oblong-ellipsoid, 19 to 21 long, 6 to 6.5 
# thick; hymenial gelatine blue with iodine; spermatia oblong, 6 to 8 » long, 0.75 
thick, sterigma straight. 
On earth. Type locality, foothills of Santa Monica Range above the Soldiers’ 
Home. 
Type deposited with Doctor Nylander; duplicates with Prof. Bruce Fink, in the 
U.S. National Herbarium, and in herb. Hasse. 
—— 
ON ee, 
