—30 — 
Reaction K+>crimson, K(C)+cortex alone. 
Thallus whitish-glaucescent, expanded, orbicular, membranaceous but 
rigid, appressed but loosely adherent, lobate, the divisions broad, rather 
radiate, margins sinuous, unbroken at the periphery, where rounded and 
depressed; centrally uneven and puckered, somewhat imbricate, the bor- 
ders elevato-decurved ; above smooth, opaque or somewhat shining, desti- 
tate of soredia, isidia. or cilia; within white; below black and sparsely 
rhizinose, at the circumference yellowish or brownish and broadly glabrous. 
Apothecia short pedicillate, cup-shaped, disk reddish, imperforate, margin 
entire, sometimes incurved exciple smooth or at length scrobiculate. Spores 
ellipsoid fi. 
This is a tropical species, but should be found within the southern limits 
of the United States and in the Central American region. There is no record 
of its occurrence in Continental North America however, that may be inter- 
preted as applying to the plant here defined. 
Parmelia coralloidea (Mey. & Flot.) Wainio Etude Bresil I, p. 33; P. per- 
lata var. coralloidea Mey. & Flot. in Act. Ac. Leop. Nat. Cur. XIX, 
Suppl. I (1843), p. 219; P. tinctorum Despr. ; P. praetervisa Mull.;/'. 
per lata var. platylobaM.\i\\. 
Reaction K+, C+intense red, Wainio. 
Thallus whitish or cinereo-glaucescent, sometimes centrally dirty-ciner- 
eous, broadly expanded, orbicular, rather appressed but not adherent, lob- 
ate, the divisions ample, margins slightly decurved, sinuous, at the periphery 
rounded or broadly crenate, depressed and plane, centrally confusedly 
uneven and puckered; above opaque or slightly shining, destitute of soredia, 
or cilia, but more or less isidiose; within white; below black, at the circumfer- 
ence yellowish-brown and glabrous, smooth or minutely rugose centrally 
and here and there slightly rhizinose. Apothecia cup-shaped at length ex- 
planate, disk rufescent, continuous or sometimes perforate, the margin com- 
monly entire but sometimes fissured, the exciple smooth or isidiose. Spores 
//. Invariably smaller than in P. latissima. As observed by the 
writer the greatest length for spores has been 18 ju, that for diameter 10 ju. 
The plant is commonly found on trunks of trees, sometimes on shrubs, 
and often on fences and palings. 
Examined from St. Martinville, La , A. B. Langlois, the specimen hav- 
ing been identified by Nylander as P. latissima-, in another example from 
the same locality and collector, issued by Miss Cummings No. 122 L. B. A. 
as P. latissima with the note “ differs from the type in being isidiophorous ;” 
Okeefenokee Swamp Ga., L. P; Ricker; Thomasville, Ga , Mrs. Taylor; 
vicinity of Sanford, Fla., S. Rapp; and Island of Jamaica, Miss C. E. Cum- 
mings. Reported from Mexico, Dr. Maury. 
The species strongly resembles P. latissima in appearance, but may be 
readily distinguished by the reaction, the isidia, and the smaller spores. 
Parmelia cristifera Tayl. in Hook. Jour. Bot. 1847, p. 165; P. latissima 
forma cristifera (Tay.) Hue Lich. Ex,-Eur. I, p. 105. P. glaberrima 
Kremplh. pro maxima parte. 
