R. H. Howe: MANvuAL OF THE GENUS USNEA 3 
trivial and opinionable character. Of this type we have, curiously 
enough, in our area no named examples in this genus. Others 
based on mere morphological reduction, a condition seen in U, 
plicata, U. longissima, and U. angulata, as represented by compar- 
ing specimens from the southern and northern limits of their range, 
hardly need titles of separation, nor do the abnormally developed 
examples growing in regions under particularly acceptable condi- 
tions. Usnea strigosa (Ach.) and U. californica Herre represent 
this class 
UsneEa * (Dill.) Adans. Fam. Pl. 2: 7. 1763 
DESCRIPTION : Apothecia lateral, subterminal or terminal, 
peltate, applanate, coriaceous, emarginate, periphery generally 
ciliate ; thalline exciple glabrous, lacunose, echinate or ciliate, con- 
colorous, pale stramineous or virescent, sometimes pruinose (rarely 
dichroic-red). Asct clavate, containing 8 spores ; paraphyses gela- 
tinous, filamentous. Sores monoblast, hyaline, ellipsoid. Sfer- 
mogones \ateral, immersed in shallow, colorless conceptacles. 
Sterigmata simple or subsimple. Spermatia fusiform or acicular- 
cylindrical, incrassate, apices truncate. Soredia normal, occa- 
sional on all forms. Cepha/odia lateral, concolorous or darker, 
sometimes black. Zha/lus erect, subpendulous, or pendulous, 
branched, fibrillose or efibrillose, terete, compressed or angulate, 
nitidous, ‘glabrous, scabrous, squamose, or inion papillate or 
epapillate, pale stramineous, virescent, green, or tawny ; cortex 
subcrustose, subcontiguous, bambusaceous, or articulate ; gonidia 
“ Protococcus”’ ; + medulla cottonous, central indurated chondroid 
cord percurrent.{ 
Thallus papitlate 
UsNEA FLORIDA (L.) Web. 
Type: Species based on Usnea vulgatissima of Dillenius ; the 
Dillenian specimens “typical and fertile’’ are in the Dillenian her- 
barium, Botanic Gardens, Oxford, England, and are “‘ Usnea florida 
(L.)”’ fide Crombie. § 
* From the Arabi snah 
+ ** Cystococcus humicola’’ according to A. Schneider, Text-Book Lich, 99. 
1897. 
¢ For Ler ree see Schwendener in Naegeli, Beitr. Wiss Bot. 2: 110- 
on at 1860. lander, oer Lich. pl. 8. f. 7-21. 1858~60 ; and Schulte, 
ae Bot. Coane: i 1-22 ; 
3 Jour. Linn. Soc. 17: cae 1880. 
