MAXON—STUDIES OF TROPICAL AMERICAN FERNS. 35 
sinus, rather close, separated by narrow acute or acutish sinuses, the margins minutely 
revolute, subentire or toward the subobtuse or obtuse apices minutely but distinctly 
crenulate-serrate; costules elevated, glabrous above, below stouter and deciduously 
grayish to brownish furfuraceo-paleaceous at the base; veins free, 19 to 23 pairs to 
the segment, once-forked or one of the branches again forked, in the case of the lower 
veins the first fork close to the costule, the branches soriferous about halfway to the 
sinus; most of the veins forked about | mm. from the costule, the branches strongly 
elevated, very close, oblique, glabrous above, nearly so below, mostly soriferous at or 
just above the base; sori large, numerous, about 25 to 35 on each side of the costule, 
closely crowded, forming a dense usually uniserrate line much nearer to the costule 
than to the margin; indusium membranous, yellowish brown, semicircular, irregu- 
larly lobate-saccate, erose; receptacle globose, setiferous; leaf tissue herbaceous, dark 
green and sublustrous above, yellowish green and paler below. 
Hemitelia mutica, which appears to be confined to Costa Rica, was founded by 
Christ upon several specimens, the first cited being from Turrialba, altitude 850 meters, 
collected by Wercklé. This, which is here figured from fragmentary specimens 
courteously forwarded by Doctor Christ, may stand as the type. The relationship is 
with J. arachnoidea. 
EXPLANATION OF PLATE 21.—See p. 34. 
9. Hemitelia apiculata Hook. in Hook. & Baker, Syn. Fil. 29. 1868. Prats 22. 
Rhizome, stipe, and length of lamina unknown; lamina 35 to 50 cm. broad, the 
pinnze inserted 4 to 5 cm. apart, slightly ascending, opposite, sessile, narrowly oblong- 
lanceolate, not narrowed at the base, 18 to 30 cm. long, 2.5 to 4.5 cm. broad below the 
gradually long-acuminate apex, pinnatifid throughout from two-thirds to nearly four- 
fifths the distance to the costa, the costa stout, stramineous, prominent on both sur- 
faces, glabrous above, essentially so below; segments 30 pairs or more, close, separated 
by very acute linear sinuses, slightly oblique, elongate-oblong, 7 to 9 mm. broad, dis- 
tinctly but lightly falcate in the outer half, the apices acuminate and sharply aristate, 
the margins everywhere lightly revolute, distantly subserrulate, the yellowish costules 
glabrous and distinctly elevated upon both surfaces; inferior basal segments sometimes 
broader and coarsely incised upon the proximal margin; veins free, 12 to 14 pairs, 
oblique, distinct, elevated, glabrous, almost invariably once-forked near the base (or 
rarely again forked), each branch goriferous about two-thirds or three-fourths the dis- 
tance to the margin or beyond, the sori forming a single line; sori rather small, apart; 
indusium small, narrow or broadly ovate, simple, cucullate, yellowish brown, recep- 
tacle cylindric-globose, short, setiferous; leaf tissue herbaceous, scarcely lustrous, 
much paler below. 
Type Locatiry: Mexico (Sierra San Pedro Nolasco, Talea, etc.), 1843-44, C. Jiir- 
gensen 873. 
Distripution: Apparently confined to Mexico; ascribed to Brazil in error. 
Hooker’s remark, following his description of this species in the Synopsis Filicum, 
is as follows: ‘Hab. Mexico and Brazil.—My specimen of 5 pairs of pinne, partially 
fertile, has very much the appearance of H. (Euhemitelia) grandifolia; but the lobes 
are submucronate and pungent at the apex, and the veins are everywhere quite free.”’ 
The Mexican plant here referred to is Jiirgensen’s 873 (sometimes written 273), and 
plate 22 is from a photograph of Hooker’s “specimen of 5 pinnx,”’ which is now in the 
Kew Herbarium. Doctor Underwood states (in MS.) that he was unable to find any 
Brazilian material under this name at Kew, but a memorandum from the Director of 
the Royal Gardens, dated January 1, 1910, contains the statement that ‘the species is 
represented at Kew by the following specimens only—Mexico, Jtirgensen 273; Brazil 
Burchell 2527, Glaziou 2420.” 
From the foregoing it will be evident that Hooker’s description was drawn with 
especial reference to Jiirgensen’s 873; that the Brazilian reference was included inci- 
32870°—12——2 
