546 
jfornicum. These are perfectly distinct, and O. Engelmannt has a 
wide range, having been found in all the larger herbaria, such as 
those of Torrey and Gray, Eaton and Underwood, Canby and Gil- 
bert, Engelmann and the National Herbarium. O. Calfornicum 
has thus far been seen only from the type locality at San Diego, 
California, where it was originally discovered in 1850, and speci- 
mens sent to Dr. Torrey by Dr. Parry, and from two other stations. 
Through the kindness of Dr. Evans, Dr. Robinson, Dr. Rusby 
Prof. Underwood, Mr. Pollard, Mr. Davenport and Prof. Trelease I 
have been able to see a large number of specimens of this genus 
and have been particularly interested in studying the variations 
of O. vulgaium. Seven different forms of the sterile lamina can be 
named as follows: 1. Ovate-amplexicul,acute. 2. Ovate-sessile, 
obtuse. 3. Ovaland elliptical,acute and obtuse. 4. Oblanceolate 
or obovate with tapering base. 5. Lanceolate and smaller. 6. 
Rotundate (immature). 7. Linear-lanceolate, occasional. 
It seems a little difficult to tell some of the young fronds of O. 
vulgatum from the mature ones of O. arenarium, and yet the ex- 
tremes are so different, and the habit and habitat so distinct, that 
I have concluded to maintain them as separate species. That O. 
arenarium has originated from O. vulgatum, and that intermediate 
forms may be found in young or poorly developed forms of O. vul- 
gatum does not alter the view from the modern standpoint of evo- 
lution. 
Young and immature specimens of what have been supposed 
to be O. vulgatum have been collected by a number of American 
botanists. In the Torrey Herbarium, unnamed, there is a sheet 
with six small immature specimens, two bearing fertile spikes and 
the following note by Dr. Gray: 
Ophioglossum n. sp. I send you % I have and probably shall — 
not be able to procure any more very soon. 15 or 20 specimens 
were found on a dry hill at Exeter (Otsego Co.) 12 of them in 
fruit. : A few specimens are in the hands of a friend who first no- 
ticed it, Dr. Hadley has a specimen and I sent some to Beck 2. — 
years ago (the same summer it was discovered). ‘He has never — 
given an opinion or said a word about it. Ido not know thatO. 
vulgatum or any other species has been found in this section. It 
appears to come near O. pusillum Nutt. but that species has 
“ frond cordate acute ”—this has the frond acute at the base and 
