50 UnDERWOoOOD: INDEX TO THE 
more slender habit, and the distant cuneate segments will readily 
distinguish it from B. Lunxaria. The European species also occurs 
in British America and Alaska and in the high mountains of 
Colorado. The smaller species of this genus present as close a 
series as the much larger ¢erzatum group and should:receive more 
thorough field study. In this species the leaf is rarely quite 
short-stalked and in one or two specimens seen the number of 
segments is abnormally increased to fifteen. On the whole, the 
plant is rather nearer B. tenebrosum, but differs in its broader 
cuneate segments which are entire or flabellately lobed. In its 
habitat in rocky woods it is quite unlike B. Lunaria of Europe, 
which commonly grows in open meadows. 
Botrychium palmatum Pres| = B. LANCEOLATUM, 
BorrycHIumM puMIcoLA Coville; Underw. Our Native Ferns, ed. 
6. 69. 1900; Bull. Torrey Club, 28: 109. pl. 7. 1901.— 
Oregon. ) 
Botrychium pusillum sp. nov. 
A low plant related to B. matricariae, branching below the 
surface of the ground and bearing small ternately compound 
leaves. Stem 1 cm. long (rarely longer when growing deeply), 
buried, pale: leaves about 3 cm. wide by 2.5 cm. long, on a short 
petiole 1-1.5 cm. long, the lateral divisions tripinnatifid, the 
terminal scarcely exceeding the lateral, the ultimate segments 
closely placed, rounded, wider and sometimes lobed above, 2.5-3 
mm. broad, with entire margins; texture fleshy ; veins imperceptible: 
sporophylls 4-8 cm. long (including the stout stalk), the panicle 
tripinnate, 3-5 cm. long. 
Mexico: Wet meadows, Sierra de las Cruces, State of Mexico, 
3000 m., II Sept. 1892, Pringle, 5192. (Type in herb, Under- 
wood.) 
Differs from B. diternatum in its seasonal development, being 
autumnal instead of vernal, in its stalked leaves, and its more com- 
pact fleshy entire segments. Related more nearly to B. matri- 
cariae in size, but differing in its stouter form, its entire segments 
and its concealed veins. : 
BorrycHiuM RAMosUM (Roth) Ascherson, Fl. Brand. 1: 906 
1864. 
Osmunda ramosa Roth, Fl. Germ. 1: 444. 1788. 
Botrychium matricariaefolium A, Br.; Déll. Rhein. Fl. 24 
am Pe Wie Sy a PR SNE eee 
