CERES uos 
1913] Blake,— Forms of Ophioglossum vulgatum 87 
broad as long, in an extreme case 45 by 27 mm. All these forms, al- 
though dissimiliar enough in their extremes, intergrade so gradually 
and completely that their recognition even as formae does not seem 
practicable, but the following plant, though it also 
inosculates with the other forms, is so distinct 
and generally recognizable as to deserve a name. 
OPHIOGLOSSUM VULGATUM L. f. pseudopodum, 
n. forma, folio oblongo obtuso basin versus peti- 
oliforme angustato. Sterile segment oblong, ob- 
tuse, 69-122 mm. long, 9-26 mm. wide, situated 
at or below middle of axis, tapering into a con- 
spicuous petiole-like base one-fourth to two-thirds 
the length of rest of leaf. Specimens examined: 
Marne: Bridgton, Cumberland Co., Aug. 1905, 
M. H. Grant; Vermont: Ferrisburg, 19 June 
1881, Faxon; New HAMPSHIRE: sphagnous mead- 
ow, Sharon, Hillsboro Co., 2 Aug. 1909, Blake 
(TYPE SHEET no. 682 in my herb.); other speci- 
mens collected at various dates; CONNECTICUT: 
Manchester, 1899, A. W. Driggs; MicHIGAN: low 
dump ground, Aug. 1888, Farwell 584; ARIZONA: 
Huachuca Mts., Sept. 1882, Lemmon. 
The following plant, lately described by Clute 
as a variety of O. vulgatum, should be reduced 
to formal rank as a mere ecological development, 
which the plant above described certainly is not. 
Through the kindness of Mr. W. A. Poyser, its 
discoverer, I possess a fertile specimen, which has 
a sterile segment with lamina 5 cm. long and 1.5 
cm. wide on an attenuate base 12.5 cm. long. 
O. VULGATUM f. lanceolatum (Clute), n. comb. 
O. vulgatum var. lanceolatum Clute, Fern Bull. xix. 
72 (1911). Sterile segment with a very long 
linear base, as above described, due to growth 
among clumps of sedge. Specimen examined: 
PENNSYLVANIA: between hummocks in Pratts 
Swamp, Lima, Delaware Co., 3 July 1908, W. A. i 
Fig. 1, 0. yuga- 
Poyser. tum f. pseudopodum, 
The plant described from New Jersey some Leaf from type. 
years ago as Ophioglossum arenarium E. G. Britton 
seems, as already noted by Clute, to be merely a starved form of O. 
vulgatum, with narrowly lanceolate leaf situated below the middle of 
