( 265 ) 
Of Sagedia, Koerb. Syst., this author reckoned ten species (all of 
them subsumed by Nylander, Pyrenoc. p. 36, under his Verrucaria chlo- 
rotica) and four others are added in his Parerga. Beyond Europe and 
North America, the group is represented in Peru, and Polynesia (Nyl.). 
Four, more or less distinguishable forms, are known to me as North 
American. 
Sagedia chlorotica (Ach.) Mass. Granitic rocks. The spores are now 
quadrilocular, measuring 0,015-23™™- long, and 0,0035-45™™- wide; New 
Bedford (Mr. Willey). But much more commonly we find more elongated, 
dactyloid-fusiform, 6-8-locular spores, measuring 0,025-40™™: long, and 
0,0045-7"™- wide; New Bedford and Weymouth (Mr. Willey) North Car- 
olina (Dr. Curtis). The two forms do not appear to be distinguishable 
otherwise from each other; or from the European species (Verr. chlorot- 
ica & V. macularis, Zw. exs. m. 152,153. Sagedia macularis, Koerb.). 
—No distinction is admitted by Nylander between the corticoline forms 
subsumed by him under his Verrucaria chlorotica, and the saxicoline. 
And looking only at the European lichens in question, this construction 
appears to be sustained, in any full comparison, by the spores. Like 
Sagedia chlorotica as here understood, the corresponding bark-lichen, as 
it occurs in Europe, exhibits broad-fusiform, quadrilocular spores, meas- 
uring 15-23 micromill., in length, which pass finally into much longer 
(Hepp Abbild. n. 48) 6-8-locular, finally clavate ones (Leight. Ang. Lich. 
t. 18, f. 1) which reach 32-36™™™- in length. These dimensions may well 
be exceeded in the plant described by Leighton; and we have then, in 
our North American Sagedia Cestrensis (Verrucaria, Tuckerm. in Dar- 
lingt. FU. Cest. 1853, p. 452)! as it commonly appears —in New England, 
and southward to Pennsylvania (Dr. Michener) North Carolina (Rev. Dr. 
Curtis) South Carolina (Mr. Ravenel) Alabama. (Mr. Peters) and Louisi- 
ana (Dr. Hale)—but little beyond possibly larger apothecia, morc 
distinctly conditioned by the thallus, and more evidently and constantly 
elongated spores (averaging, in my specimens, 30-50™™,, in length, by 
2}-5™mm. in width) to distinguish it. The spore-history of our plant is 
not yet however completed. The long-dactyloid or clavate spore reaches 
finally, with us, and in forms otherwise inseparable, the full acicular 
shape, measuring then, in Weymouth and New Bedford specimens (Mr. 
Willey) 41-57, 53-57, and 53-76™"™., in length, and 24-33", in width ; 
and in Alabama ones (Mr. Beaumont) 69-83™™™,, in length, and 24-3™"™., in 
width. The Massachusetts specimens with longest spores were on Hem- 
lock ; and Mr. Willey has recently sent others, from the same bark, the 
spores of which reach 72-118™™™,, in length, and 3-4™™™- in width. I 
possess what seems the same lichen from Beech trunks in Japan (Mr. 
Wright) the acicular spores of which measure 41-64™™™-, in length, and 
1 Y. Cestrica, as named by me, and cited in Nyl. Pyrenoc. p. 36; but changed, 
as above, by the author of the Flora Cestrica. 
34 
