SuscLass: ASCOLICHENES Zahibr. 
Lichens in which the spores are enclosed in asci. 
ORDER: GYMNOCARPALES.: (Luyken) Fr. 
Apothecia open, hymenium visible. Lichens of this order are called 
gymnocarpous. 
SUBORDER: CYCLOCARPINEA Wain. 
Apothecia discoid; spores maturing in asci: no capillitium. 
GRouP: RADIATA Hue. 
Thalline structure radially symmetrical; attached to substratum 
without rhizoids. Gonidia homceomerous. 
FamMILy: USNEACEAE Eschw. 
Thallus fruticose or filamentous, radial, with contiguous cortex: 
cylindrical or angular, bifacial or deformed. Gonidia protococcoid. 
Apothecia lecanorine. Spores monoblast, bilocular or muriform—hyaline 
or colorate. k 
TRIBE: USNEAE Hue. 
Cortical structure complex (decomposed). Medulla arachnoid. 
GENUS: USNEA (Dill.) Adans. | 
‘Cortex cylindrical or angular. Medulla stuppeous. Axis chondroid. 
Apothecia ciliate, disk pale. Asci clavate, 8 spored. Spores ellipsoid, 
monoblast, hyaline. 
SERIES: MESINAE Zabhlbr. 
Axis 1-3 diameter of thalline filament. 
Erect or sub-erect 
Esorediate : ; : ‘ : Se 2 : . florida 
Sorediate Eo 
Virescent  . ‘ : : : : : : : hirta 
Reddish : ; : : : : } . rubiginea 
Not erect feendulous): 
Primary branch over 1-2 mm. diameter at base. 
Thallus foveolate ; : : . : : cavernosa 
Thallus not foveolate 
Branches espinulose, 
Branches evolute : aaa : ; : plicata 
Fibrils lacking, : : F : ; . v. Huer 
Branches spinulose 2 : . dasypoga 
Primary branch under 1-2 mm. ainmieter at age 
Thallus smooth trichodea 
SERIES: PACHYNAE Zahlbr. 
Axis 1-2 diameter of thalline filament. 
Primary branches angulate ; : ; : : . angulata 
Primary branches terete, farinaceous . : : longissima 
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