141 195 
201. Dryopteris gongylodes (Schkuhr) O. Ktze. Rev. Gen. Pl. 2: 811. 1891; 
C. Chr. Ind. 268. 
Syn. Aspidium (goggilodus/ Schkuhr, Kr. Gew. 1: 193 tab. 33 c. 1809. 
Aspidium obtusatum Schkuhr 1806. 
Nephrodium unitum Bak. Syn. Fil. 289 et auctt. plur.; Jenman, Bull. 
Dept. Jamaica n. s. 3: 189. 1896. 
Aspidium Pohlianum Pr. Del. Prag 1: 173. 1822. 
Goniopteris cheilocarpa Fée, Gen. 251. 1850—52. 
Nephrodium paludosum Liebm. Vid. Selsk. Skr. V. 1: 275. 1849. 
(For other synonyms see Index Filicum). 
Type from Essequebo. 
In Herb. Swartz (S) I have seen a specimen no doubt of the type collection, 
named by Swanrz Aspidium obtusatum, under which name it was figured by 
Scukunn on his plate 33 c. Later on Scukuun renamed the species acknowledging 
that it were not the original A. obtusatum Sw. Most pteridologists have called the 
species Aspidium (resp. Nephrodium) unitum identifying it with Polgpodium unitum 
^L. but the species of LiNN;EUS is said also to be the same as Nephrodium cuculla- 
tum Bl., andj it is, therefore, best to let Scukunn's name stand for our species, 
also because it was applied to the most common American form. 
D. gongylodes is a well-known bog-fern, found in almost all tropical and sub- 
tropical regions. Its long creeping, black and nearly naked rhizome, its papyra- 
ceous to coriaceous lamina, which is not narrowed below, its rather distant and 
narrow pinnz with obtusely rounded lobes, its close veins with the two basal ones 
always truly united, make it easily recognizable from the allied species of this 
section, of which it is the nomenclaturic type. It varies mainly in pubescence, 
and one can refer most of the American forms to two varieties, which, however, 
are connected with intermediate forms: 
1. var. glabra Mett. As a rule quite hairless but often rather scaly on the 
coste and costule beneath and most often more or less glandulose by large, 
capitate glands. These glands are often very numerous on the costulae and veins 
and indusia and are here sessile, and in some forms they also are found on the 
receptacle, intermixed with the sporangia, but here they are stalked. In the com- 
mon South Brazilian form described as Aspid. Pohlianum Pr. (t. sp. orig. Herb. 
PRESL), which is often exindusiate, these glands are, as a rule, very numerous, but 
they are also to be found in several specimens from the West Indies and Florida. 
2. var. hirsuta Mett. Lower surface and indusia rather hairy by short hairs; 
glands absent or some few are found, mostly among the sporangia; the receptacu- 
lum is sometimes also hairy. This form occurs in Southern Brazil, Mexico and in 
the Lesser Antilles, while the specimens from the Larger Antilles, Florida and 
Central America mostly belong to var. glabra, which is the typical form as figured 
by ScukuHng. In size and general habit the two varieties quite agree. They are 
