552 
resembles the smaller, ovate-lanceolate forms of Europe. Prof. 
Eaton gives the range as follows: “Canada and New England to 
Texas and Arizona, also Unalaska, Europe, Asia, Madeira and the 
Azores.” All the specimens from Texas and Arizona thus far 
seen have been found to be O. Exgelmanni. I have not seen any 
of the Madeira specimens which Prantl describes as smaller, and 
approaching O. usitanicum. The Azores specimens sent to me by 
Prof. Trelease and listed by him as O. valgatum polyphyllum (8th 
Rept. Mo. Bot. Gard., 175. 4. 6g) have been variously recognized 
as a good species under the names of O. polyphyllum and O. Azori- 
cum. They resemble our O. pusillum and are certainly quite as 
distinct. O.vulgatum has been collected in four Canadian stations 
by Macoun and Dawson; it is common in New England, and be- 
comes rarer southward, through New York, New Jersey, Penn- 
sylvania and Maryland, overlapping the range of O. Engelmannt 
in Virginia, Tennessee, Kentucky and Indiana. Several smaller, 
ovate forms have been collected in Louisiana and Florida by Hale 
and LeConte, and Blasdale has collected what appears to be this 
species in California. The specimens from Unalaska are either 
some unknown Asiatic species, or a new species of the O. reticu- 
latum group, in which I here describe them as O. Alaskanum. 
In habitat the North American stations vary from open woods, 
dry pastures, worn out mowing fields to boggy places with 
Arethusa and Pogonia ophioglossoides. In dry pastures it is stunted, 
in wet grassy places it is larger and less rigid. It is likely that 
most of the stations recorded in the Fern Bulletin by Miss Price 
from Kentucky, in dry open cedar woods belong to O. Engelmanni, 
as do all those from sterile and rocky hillsides in the Central and 
Southwestern States. 
Prantl, in his monograph, recognizes 29 species, of which 8 
have thus far been found in the United States; 27 of these are in 
the Luophioglossum section with entire sterile fronds, and all 
our species except O. palmatum of Florida belong to this sec- 
tion. The following key has been modified and adapted from his 
to include only the North American species : 
I, EVOPHIOGLOSSUM.—Sterile frond simple, fertile spike I. 
PARANEURA.—Sterile frond with several equal parallel veins at base, midvein _ | 
seldom if at all branched, though generally anastomosing with the lateral veins by © a 
short oblique veinlets, often disappearing below the apex. - 
