574 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Hieronymus, who have presumably examined the original specimens, it is also 
partly P. leucosticton. 
The following specimens are in the U. S. National Herbarium: 
Mexico: Jalapa, Veracruz, Oreatt 2806. Region of Orizaba, Bourgeau 
2895 (distributed as P. cheilostictum). Cérdoba, Veracruz, Fink 61, 
73. Zacuapan, Veracruz, Purpus 4375. Teziutlin, Puebla, Orcutt 4032. 
Boca del Monte, Puebla, Purpus 6426. Near Pantepac, Chiapas, Collins 
é Doyle 221. Tamasopo Canyon, San Luis Potosi, Pringle 3258, 
GUATEMALA: Cobfn, Alta Verapaz, alt. 1,300 meters, J. D. Smith 1578; 
von Tiirckheim (J. D. Smith, no. 641); von Tiirckheim Il. 1256. Near 
the Finca Sepacuité, Alta Verapaz, Goll 191; Cook & Griggs 541. Trail 
between Sepacuité and Secanquim, Alta Verapaz, alt. 1,000 meters, 
Mazon &€ Hay 3285. San Miguel Uspantin, Depart. Quiché, alt. 1,800 
meters, Heyde & Lux (J. D. Smith, no. 3255). Santa Marfa, Depart. 
Quezaltenango, Kellerman 5572. 
Costa Rica: Cartago, alt. 1,275 meters, Cooper (J. D. Smith, no. 6054). Ta- 
blazo, alt. 1,900- meters, C. Brade; Biolley. “Several sheets without 
exact locality, Cooper; Wereklé. 
PANAMA: Above Camp Aguacatal, eastern slope of Chiriqui Volcano, alt. 
2,400 meters, Mazon 5301. Above the Rfo Ladrillo, southern slope of 
Cerro de la Horqueta, Chiriquf, alt. 1,200 to 1,700 meters, Mazon 5408. 
18. Polypodium tweedianum Hook. Icon. Pl. 1: pl. 86. 1837. PLATE 39. 
? Polypodium sporadolepis Kunze var. a Mett. Abh, Senckenb. Ges. Frankfurt 
2: 67. 1856. 
Lepicystis macrocarpa Diels in Engl. & Prantl, Pflanzenfam. 1‘: 322, 1899, in 
part; not Polypodium macrocarpum Presl, 1825, 
TYPE LocaLITy : Woods of St. Xavier, Tucumén, Argentina (Tweedie). 
DistRIBUTION: Bolivia and northern Argentina, and probably northward in 
the Andes. 
ILLUSTRATIONS: Hook. op. cit. pl. 86; Diels in Engl. & Prantl, Pflanzenfam. 
1‘: f. 167. C. (as Lepicystis macrocarpa). 
In the course of an attempt to reconcile the several conflicting concepts of 
this species and its nearest allies and to determine, if possible, the precise 
original application of the name P. tweedianum, the writer has sought the 
loan of a portion of Tweedie’s type specimen, shown in Hooker’s plate 86, and 
has been informed that this specimen is not now to be found at Kew. It seems 
necessary, therefore, to interpret the species solely from Hooker's illustration, 
and this, in the light of a recent single collection by K. Fiebrig in southern 
Bolivia, does not appear to be very difficult. The plants referred to are Fie- 
brig’s no. 3265," from Pinos, near Tarija, Bolivia, which agree well with 
Hooker’s illustration of Tweedie’s type specimen from the northernmost part 
of Argentina. Although some of the fronds are larger than Tweedie’s, the 
proportionate length of lamina and stipe is about the same, as also the general 
form and cut of the lamina, the direction, shape, and number of the segments, 
and the position and number of the sori. <A difference is noted in the more 
broadly alate bases of the segments of no. 3265, especially upon the distal side, 
but this is not very pronounced and is perhaps no more than an individual 
variation. 
Interpreted upon the basis of Fiebrig’s plants, P. tweedianuwm shows an 
unmistakable alliance with P. plebejum and nearest relatives in several par- 
*The specimens studied are in the Gray Herbarium and in the U. S. National 
Herbarium, 
