Howe : Preliminary notes on the genus Usnea 327 



J^xplanatloii of plates 21-23 



^ 



Plate 21 



Usn^a barbaia c^ratina collected dX South Canterbury, Conn., by Mrs. S. B 



Hadley. Very slightly reduced. 



Plate 22 



Papillate species 



1, Vsnea harhatajlorida Fr. 



2. Usnea harbata Jlorida^ f. strigosa Ach. Notice short branching and large 



apothecia. 



3. Usnea barbaia florid a ^ f, kirta Fr, Notice hirsute condition and sorediate termi- 



nal fibrils. 



4. Vsnea barbata ceraiina Schaer. Notice coarse character and frequent presence 

 of apothecia. 



5. Usnea barbata dasypoga Fr* Notice similarity of fibrillization to that of U 

 longissima Ach. in lower specimen. 



6. Unea barbata plic at a Fr. Notice almost entire lack of small fibrils (see text). 



All slightly reduced in size. 



Plate 23 



Epapillate species 



I, Usnea cavernosa Tuck. Notice similarity of fibrillization to that of U trichodea 



Ach. 



2. Usnea longissima Ach. Notice delicateness of main fibril as compared with V. 



b. dasypoga Fr. 



3. Usnea trichodea Ach. Notice similarity in fibrillization to that of the upper 



specimen of U. b, dasypoga Fr. 



4. Usnea angulaia Ach. Notice similarity of fibrillization to that of U, b, florida 

 Fr., intermediate between U longissima Ach. and U. b. dasypoga Fr. 



