198 
CHRIST. 
16. Dryopteris procurrens (Mett.) 0. Ktze. Rev. Gen. PL 2 (1891) 813. 
Aspidium procurrens Mett. Ann. Lugd. Bat. 1 : 231. 
Luzon, Province of Laguna, Pagsanjan (1992 Copeland) February, 1903: 
Province of Rizal, Bosoboso (1094 Ramos) July, 1906: Province of Bataan, 
Mount Mariveles (226, 1389 Copeland) February, August, 1904. Culion (589 
Merrill) December, 1902. Mindanao, Province of Zamboanga (1693a Copeland) . 
Malaya. 
From repeated examinations of material from the Philippines I have not been 
able to determine with certainty the form described by Hooker , Synopsis 292, as 
Nephrodium latipimna, as that species is represented by specimens from Hongkong 
and Tonkin (leg. Cadiere) . 
17. Dryopteris heterocarpa (Blume) O. Kuntze Rev. Gen. PL 2 (1891) 813. 
Polypodium heterocarpum Blume Enum. (1828) 155. 
Luzon, Province of Laguna, Mount Maquiling (2027 Copeland) March, 1906. 
Sunda Islands. 
18. Dryopteris canescens (Blume) C. Chr. Ind. (1905) 256. Polypodium 
canescens Blume Enum. (1828) 158. Gymnogramme canescens Blume Fil. Jav. 
93. t. 40- Aspidium canescens Christ. Ann. Jard. Bot. Buitenz. 15 1 : 130. 
The Philippines share with Celebes a plurality of forms of this species, interest- 
ing because of the numerous more or less “insular” forms into which it is 
divided. I refer the reader to what I have said regarding it in Ann. Jard. Bot. 
Buitenzorg 1. c., where I have shown its affinity to the group containing P. 
parasitica of which it appears to be a weakly derived species, weakly derived 
because of its generally reduced dimensions, the indusium frequently lacking, 
and its sori irregular, but above all in the variation in the form of the fronds 
which present all forms of pinnae from those linear and elongated to those 
variously cut, lobed and dilated in a most bizarre manner, and finally in the 
dimorphism and narrowness of the fertile fronds which have much elongated 
stipes and the pinnae so narrowed that the sori lose their distinctness and form 
a mass which entirely covers the narrow fertile pinnae, in this latter respect 
resembling those of Egenolfia appendiculata. 
In Celebes I have distinguished three forms — nephrodiformis, which is scarcely 
dimorphous; gymnogrammoides, with the fertile fronds somewhat reduced; and 
acrostichoides with the fertile pinnae narrowly linear. For the species as it 
occurs in the Philippines, this distinction does not suffice, and it is necessary to 
distinguish a large number of forms, some of which have acquired the value of 
subspecies, or perhaps in some cases, of species. These forms I characterize as 
follows : 
Var. lobatum n. var. 
Statura minore, stipite longiore (20 cm., frondis 20 cm.) pinnis minus 
numerosis, latioribus, lobis latioribus, paucioribus, profundioribus nervis 
flexuosis, interdum irregularibus, aream imam costalem formantibus, 
pubescentia sensiore grisea imprimis costas nervosque tegente, et soris 
indusiis carentibus, saepe irregulariter elongatis. 
Luzon, Province of Rizal, Mabacal ( Loher ) March, 1906: Province of Ben- 
guet, Baguio ( 1866 Copeland) November, 1905. 
Java, Celebes. 
This variety more or less resembles the large form figured by Blume and 
approaches a small D. parasitica, but the stipe is relatively longer, 20 cm., the 
frond 20 cm., the pinnae less numerous, longer, the lobes longer and more numerous 
and more deeply divided, the nerves very undulating, forming one costal areola, 
pubescent. 
