276 Rhodora | NOVEMBER 
tenebrosum they are always on the margin of the otherwise unaltered 
segment (Fig. 5). The differences in the sterile fronds are very 
noticeable even in the earliest stages of the plant. 
The fertile lamina of B. matricariacfolium is decompound in full 
grown plants, the rachises are terete, the sporangia sessile or stalked, 
while in B. /enebrosum the spike is usually simple, rarely once pin- 
nate, the rachises are broad, the sporangia sessile in rows or groups 
on each side, apparently buried in the tissues in life (Fig. 3, 4).! 
The spores of B. matricariacfolium are 308—396 p, averaging 352 
p, covered with coarse tubercles or warts ; those of B. Zenebrosum are 
396-528 m, average 484 p, and are finely verrucose. I have pre- 
viously? shown that the bud is elevated each year sufficiently to 
counterbalance the aggregation of leaves. The older portion of what 
may be considered as the rootstock persists for several years, and 
I found several plants in Maine, in which new plants were forming 
adventitiously from the oldest remaining nodes. 
Ames BorANICAL LABORATORY, North Easton, Massachusetts. 
EXPLANATION OF PLATE 48. Figs. 1, 3, 4, 5 are of dried specimens of 
Botrychium tenebrosum, A. A. Eaton, natural size; Fig. 2 is of an herbarium 
specimen of B. matricariaefolium, natural size. Specimens 1, 3, 5 were col- 
lected in Skowhegan, Maine ; specimen 4 in Brocton, Massachusetts. Nos. 
1, 3, 5 have the sterile segment spread out in pressing; no. 4 shows it 
conduplicate in characteristic manner. At a, Fig. 3, an adventive shoot, 
springing from a root, is seen. Fig. 6 shows the bud of B. Zenebrosum, 
magnified ; Fig. 7, that of B. matricariaefolium, less magnified. Figs. 8, 
9 show the apices of sterile fronds of B. sexebrosum ; Fig. 10, that of the 
B. matricariaefolium figured above. Figs. 6-10 were drawn with the 
camera lucida. The others were traced from specimens. 
GAYLUSSACIA DUMOSA AND FRONDOSA IN NEW HAMPSHIRE: — A 
CorRECTION.— Owing to a curious and quite unaccountable mixture 
of labels and specimens a misstatement was made by me in RHODORA, 
III, 1901, 193-194 under Gaylussacia dumosa. The specimen sent 
me by Mr. Alvah A. Eaton was collected by him at Muddy Pond, 
Nottingham, New Hampshire on September 15, 1899. Mr. Eaton 
collected Gaylussacia frondosa at French's Pond, North Hampton, 
New Hampshire (the station I gave for G. dumosa) on June 20, 
! Since writing the above I have seen Prof. Underwood's fine series of speci- 
mens, one of which is somewhat ternate and similar to B. simplex, var. sub- 
compositum. 
? Papers Boston Meeting of Fern Chapter, 26. 
