13 R. H. Howe: MANUAL OF THE GENUS USNEA 
DeEscRIPTION —typical: TZhallus pendulous, slender, wzo//i- 
tinous, terete or subterete, virescent, cortex glabrous or granulose, 
annularly scarred, at length bambusaceous; pramary branches 
slender, at length proximally scabrous, foveo/ate (max. length 35 
cm.); secondary branches dichotomous, much divided, foveolate ; 
fibrils capillaceous, tortuous. Apothecia common, emarginate or 
submarginate, at length lacerate, lateral, sessile, ssva// (diameter 
4 mm.), disk flesh-colored or buff, periphery. ciliate. Spores 
5-10 ft X 4-7 Hb. 
CONTINGENT PHASES: Unobserved. 
SUBSTRATA: Coniferous and deciduous trees. 
GEOGRAPHICAL DISTRIBUTION: Common in a_ broad _ sense 
throughout the Transition zone. I have a typical specimen from 
Brunswick, Maine. It is reported from the White Mountains by 
Tuckerman, and I have seen two specimens from Plymouth, N. H. 
It is common in Minnesota about Lake Superior, and I have 
examined material from Colorado, Washington (Puget Sound, 
fink), Arizona, and Mexico (Jalaspasco, 10,000-12,000 ft.) ; 
Nylander records it from Michigan; Leighton from Great Slave 
Lake, Canada, well within the Boreal zone. 
UsNEA ANGULATA Ach. 
Type: Not indicated, but the specimen on which the species 
was. based is in the Acharian herbarium, Universitetets Botaniska 
Institution, Helsingfors, fide Prof. Dr. Fred. Elfring, zx /7tt. 
Type Locarity: ‘“ Americae Septentrionalis”’ (Pennsylvania— 
Muhlenberg). 
ORIGINAL DESCRIPTION : “ Thallo pendulo flexuoso subsimplici 
angulato cinereo-pallido, angulis acutis scabris, fibrillis horizontal- 
ibus approximatis simplicibus brevibus tereti-attenuatis,’’ Ach. 
Synop. Meth. Lich. 307. 1814. 
Figure: Harris, Bryologist 4: p/. 7.f. —; pl. 2.f.c.  19g01. 
Synonymy: Usnea angulata Ach. Joc. cit. 307. 1814. 
Diacnosis: Zhallus pendulous, subsimple, axzgudate. 
DescriPTIon —typical : Za//us pendulous, simple, rigid, coarse, 
angulate, stramineous to virescent (at length fuscous), cortex sca- 
brous, now squamose; primary branches simple, angulate (now 
compressed particularly in the axils), coarse, dichotomous (max. 
length m.); secondary branches rare (common in tropical 
examples), angulate, dichotomous; /bri/s terete (or deformed), 
