MAXON— STUDIES OF TROPICAL AMERICAN FERNS. 15 



Asplenium serratum L. 



II. L65. Cubilquitz, altitude 350 meters, July, 1907. Epiphytic. 



Asplenium tuerckheimii Maxon, pp. nov. 



Fronds few (3 or 4), 30 to 40 cm. Ions, long-stipitate, borne in a small crown; rhizome 

 slender, erect or ascending, 2 to 4 cm. high, clothed with old stipe bases and bearing 

 at the apex a few rigid lanceolate dark brown scales; stipe slight, arcuate or sub- 

 flexuose, bilaterally compressed, greenish brown, lighter above, 16 to 25 cm. long; 

 lamina once-pinnate, variable in shape, broadly oblong to orbicular, comprising 3 or 

 4 pairs of membranaceous subopposite pinnae nearly equal in size, the uppermost pair 

 terminal upon the rachis, a terminal (single) pinna thus wanting; characteristic 

 pinna' 8 to 10 cm. long, narrowly lanceolate, sessile, at the base narrowly and equally 

 cuneate, falcate, broadest near or below the middle (about 1.5 cm. broad), unequally 

 long-attenuate, the margins regularly rrenate-serrate, the crenations long, shallow, 

 somewhat appressed, entire or slightly indented in the middle; midvein stramineous, 

 apparent upon both surfaces throughout; sori elongate, 5 to 8 mm. long, slightly 

 curved, uniserial, about 9 to 12 pairs, equidistant, borne on the anterior branch of 

 the mbstly once-forked veins; indusia narrow, delicate, yellowish brown. 



'Type in the U. S. National Herbarium, no. 826200, collected in the forest at Panzal, 

 Baja Verapaz, Guatemala, altitude 1,000 meters, by Baron II. von Tiirckheim, no. II. 

 1077, April, 1907. A second collection of this has since been made at Sasis, Alia 

 Verapaz, 1,100 meters, May, 1908 (no. II. 2212). 



The alliance of A. tuerckheimii is perhaps with A. abstissum Willd., though the rela- 

 tionship is by no means a close one. From this species it differs radically in its elon- 

 gate long-attenuate spaced equal pinna 1 , regular and less deeply serrate margins, 

 and especially in the usual absence of a terminal pinna— the uppermost pair of pinnae 

 commonly surmounting the apex of the rachis, as in certain forms of Danaea. Some 

 variation in this last particular is noted in two specimens from the District of 

 Cordoba, State of Vera Cruz, Mexico (//. Fink 41 and 135), in the U. S. National Her- 

 barium, which are otherwise the same; several of these bear an odd terminal pinna. 

 No. 41 was distributed as A. euUrifolium. 



Asplenium sp. 



II. 1047. Coban, altitude 1,350 meters, February, 1907, and March, 1908. 



Small plants closely allied to Asplenium verecundum Chapman, a a Florida species 

 which occurs also in Cuba, and the South American A. divaricatum Kunze, figured by 

 Kunze & some time after its original publication. In revising this group of closely 

 allied species the Mexican forms listed by Fournier under the section Caenopteris 

 must be considered. Sufficient material for this is lacking at present. 



Athyrium achilleifolium (Mart. & Gal.) Fee. 



II. 2198. Sasis, Alta Verapaz, altitude 1,100 meters, May, 1908. 



Blechnum blechnoides (Lag.) C. Chr. 



II. 1420. Forest near Cubilquitz, altitude 350 meters, September, 1900. 



Diplazium plantaginiiolium (L.) C Chr. 



II. 1431. Near Cubilquitz, altitude 350 meters, September, 1900. 



Diplazium prominulum. Maxon, sp. nov. 



Fronds about 55 cm. long; stipes about 20 to 25 cm. long, stout, naked, yellowish, 

 from an erect relatively slight rhizome 10 cm. or more high, this with age nearly naked 

 as to chaff; lamina 30 to 35 cm. long, 15 to 18 cm. broad, exactly ovate, comprising 

 about 10 to 12 pairo of lobed horizontal or slightly ascending pinna;, the lowermost 



« Bull. Torr. Club 33: 193. 1906. 

 b Die Farrnkr. 2: 94. pi. 139. 1851. 



