176 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Lycopodium brachiatum Maxon, sp. nov. PLATE 7. 
Plants apparently terrestrial, ascending, 15 to 20 cm. long, 3 to 5 times dichotomous, 
the branches spreading, widely divaricate (60° to 90°), the tips (if fertile) almost con- 
tinuously sporangiate fora distance of 2to6cm. Stems very slender (about 0.5 mm. in . 
diameter), wholly concealed by the appressed imbricate bases of the very numerous 
closely set leaves; leaves apparently in 8 ranks, not twisted at the base, all alike, 
slightly ascending, somewhat secund, membranous, 5 to 6 mm. long, linear-subulate 
from a linear-lanceolate base (this about 0.5 mm. broad), subcapillary at the tips, entire, 
the upper surface usually somewhat concave in drying, often deeply so near the base, 
the basal portion of the leaf sometimes plicate, the apical portion often irregularly 
tortuous; costa percurrent, relatively prominent, readily visible by transmitted light, 
distinctly elevated below, the base of the leaf strongly carinate; sporophyls like the 
sterile leaves, not reduced in size; sporangia reniform to obtusely cordate-reniform, 
about 0.8 mm. broad, the sinus very deep. 
Type in the U. 8. National Herbarium, no. 22259, collected upon Cocos Island, off 
the western coast of Costa Rica, February 28, 1891, by Dr. Alexander Agassiz, during 
the cruise of the U. 8. Bureau of Fisheries steamer Albatross. 
An aberrant member of the group of L. verticillatum L. and nearest related to L. por- 
toricense Underw. & Lloyd,! which is known only from Porto Rico. Like that species 
L. brachiatum appears to be terrestrial, which is unusual for members of the verticillatum 
group. It differs from L. portoricense mainly in its strongly divaricate branches (those 
of L. portoricense diverging at an angle of 30° to 45°) and in its fewer, shorter, more 
spreading, 8-ranked leaves, those of L. portoricense being 6 to 8 mm. long, ascending, 
and arranged in 10 ranks. 
EXPLANATION OF PLATE 7.—One of the type specimens of Lycopodium brachiatum. Natural size. 
Lycopodium chiricanum Maxon, sp. nov. PLATE 8, 
Plants terrestrial, cespitose, 8 to 12 cm. high, the main stems crowded, erect from an 
arcuate base, 1 to 3 times dichotomous, the branches erect and closely fasciculate. 
Stems stout, 6 to 8 mm. in diameter (including the leaves), densely leafy, the branches 
similarly stout and equally leafy throughout, the apices sporangiate a distance of 2 to 4 
cm. or more, the sporangia wholly concealed by the sporophyls; leaves distinctly 
10-ranked upon the lower stem, 11 or 12-ranked toward the apex, crowded, radially 
arranged, not twisted, ascending, densely imbricate, 3.5 to 5 mm. long, about 1 mm. 
broad, narrowly oblong, gradually acute in the apical third, not narrowed at the base, 
more or less cymbiform, the outer surface usually convex, the tip incurved, the inner 
surface flattish or slightly concave; leaf tissue chartaceo-coriaceous, more or less spon- 
giose, the leaf often wrinkled in drying; margins hyaline, minutely denticulate-serrulate 
(most noticeably so in the apical half), the teeth gland-like, variable in shape and posi- 
tion, sometimes low or even rounded; coste percurrent but wholly concealed, their 
presence indicated by a dorsal ridge near the base or sometimes nearly throughout; 
sporophyls closely imbricate, similar to the sterile leaves but somewhat narrowed at 
the base, exactly lanceolate; sporangia reniform, 1.5 to 1.7 mm. broad, the sinus very 
broad and open. 
Type in the U. 8S. National Herbarium, no. 675719, collected upon rocky open slopes 
of the summit of Chiriqui Volcano, Panama, altitude about 3,370 meters, March 12, 
1911, by William R. Maxon (no. 5364). 
Lycopodium chiricanum is not closely related to any North American species. Onlya 
few South American members of the selago subgroup, to which this species belongs, 
have the leaves arranged in so many as 10 rows, and from these L. chiricanum seems 
altogether distinct. The foliage may be described as lutescent, or of a vivid yellowish 
green. There is no trace of red, as in many allied species. 
EXPLANATION OF PLATE 8.—T ype specimens of Lycopodium chiricanum. Natural size. 
1 Bull. Torrey Club 38: 108. 1906. 
