ASTER DIVARICATUS 113 
upper ones, sometimes alternating with them, sometimes replacing 
them for two or three nodes in succession. Such arrest sometimes 
appears on several of the stems from one clump, but seldom from 
all of a colony. The arrest-leaves are often smaller than the nor- 
mal in all dimensions, but are still more often unchanged in breadth. 
I have sought with little success for evidence of similar arrest- 
leaves from the same rootstocks during successive years ; but have 
found them produced continuous seasons from the same colony 
within a few feet at least of the previous years' examples (under 
chestnuts by Palmer Av. and paths, T Mawr Park). 
Compared with arrest- 
leaves in the Cwrvescentes 
and the Macrophylli there 
is this great difference, that 
tion of fungi is apparent. 
served very often in 
various years.— As ob- 
served in Central Park, N. 
a City, this form is late to 
Start in the spring, and its 
broad, roundish and irreg- 
ular leaves reach 17 and 
Cc 
24 in. long by Apr. 20, Obolarian form 
when those of typical A, Fig. 4, from plant of Bryn Mawr Park, N. 
divaricatus reach 2 in Y. vic., Se. '96, in hb. Bu. with typical leaf 
I" OBOLARIAN form. and bract 
spect, 
with normal ovate-acuminate and lanceolate leaves — 
sate oe with reniform, orbicular and cordate-rotund lea 
, thin, smooth, delicate green-stemmed plants, : I MP 114 
ft. high, differing from A. divaricatus L. especially in their sub- 
circular upper leaves, which suggest the form of a penny or of a 
