123 
Sph^rella ce'rcidicola. — Peritheciaerumpent (looja) scattered, 
mostly on the upper side of the leaves, at length broadly perforated 
above; asci oblong-cylindric, 35 x 5/^; sporidia closely packed, over- 
lapping and subbiseriate, oblong-pyriform, i-septate, 11-13 ^ 2-5-3/Y, 
slightly curved and constricted. 
On fallen leaves of Cera's Canadensis, J 
SPHiERELLA LaCTUCE. 
No, 550, 
Epiphyllous, on dark brown (2-4JU), 
concentrically wrinkled spots with a distinct raised border; perithe- 
ciaerumpentsubglobose (120-150/^), of coarse cellular structure; ascI 
40-75 ^ 12-14//, sessile, oblong; sporidia biseriate, ovate-oblong, 
i-septate and constricted at the septum, 14-16 x 5-//, ends obtuse. 
On living leaves of Laduca Canadensis, 
Aug. No. 619. 
The Nectar-Glands of Apios tuberosa. 
By Aug. F. Foerste. 
The flowers of Apios tuberosa are arranged in dense panicles, 
which have the appearance of racemes. At the base of the first main 
axis are two small bracts, one of them frequently subtending another 
panicle. The main axis of the second panicle has also two bracts at 
.Us base, one of which sometimes subtends a third flower-cluster m an 
insignificant rudimentary state. The third flower-cluster rarely, if 
ever, develops. The second panicle arises so close to the base of the 
first panicle that both seem to sorinsr from the axil of the leaf. 
sprmg 
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F.^.3 
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Although but one of the basal bracts usually subtends a panicle, the 
other not rarely subtends a minute rudimentary flower-cluster, which 
rarely develops its flowers. The main axis of each panicle bears at 
short distances the secondary axes or racemes, each of which is sub- 
tended by a bract. Each raceme (Fig. i) bears three flowers, all of 
them subtended by bracts. Two of the flowers are placed at either 
side of each raceme, the third being placed just above the bract sub- 
tending the raceme. The bract (Fig. 2 /^) of the third flower is smaller 
than the one subtending the raceme (Fig. 2 c). The three flowers 
^"■e placed at the very base of the short stubby axis of the raceme, 
^J^d are inserted at about the same height. The top of this axis 
^^ig- 2 a) suddenly becomes truncated, and on the flattened surface 
^nus produced may be seen the remaining aborted flower; 
^"aceme. Under a low power of the miscroscope they appear as so 
'"any clusters of lanceolate, thin scales. These clusters usually 
^'ther and fall off a short time before the flowering of the three 
ers of the 
