412 LmarLETS oF PmiLipPINE ROTANY (Vor. II. Art. 19 
i ` 
olutum is transferred from any other source; it is valid in 
Polypodium, and is satisfactorily tied down to a particular 
plant by reference to Blume’s well enough known Grammitis 
longifolia. The type specimen of P. revolutum C. Chr. is the 
type specimen of G. longifolia collected in western Java. | 
On the other hand, if publication is on p. 559, it is 
evident that the name revolutum is a transfer of Drynaria 
revoluta J. Sm. This is a nomen nudum, according to pre- 
sent general attitude, but even so it had a type, from Luzon 
(Cuming 247). It is difficult for me to see that the transfer of the 
name could change the type. The name applied to P. revolutum 
.C. Chr. can certainly have a Javan type, but P. revolutum 
(J. Sm.) C. Chr. would have to have Cuming’s No. 247 as 
its type. If, then, the Javan plants should turn out, upon 
fuller study, to be not conspecific with Cuming No. 247, then, 
J. Sm. being authority for the name revolutum, the Javan 
plant would have to be renamed, This being so, the cita- 
tion of Blume’s G. longifolia as a synonym does not fix J. 
Smith’s name nor provide the Luzon plant with a diagnosis, 
nor remove it from the class of nomina nuda. 
Under the circumstances, no botanist would knowingly re- 
name the plant, and in the course of time it would be 
provided with a description. But Christ in Philip. Journ. Sci. 
2 C (1907) 178 has thought he could distinguish differences 
between the plants collected in Mindanao and by me, P. J. 
8. 2 C (1907) 6, referred to P. revolutum (J. Sm.) C. Chr. 
and other plants called such by him; and has described the 
former as P. productum. As I had previously written my own 
opinion to Dr. Christ, and as Elmer's rich collection fully 
demonstrates, P. productum and P. revolutum are one species. If P. 
revolutum was P. revolutum (J. Sm.), and by the citation of 
J. Smith as authority, a nomen nudum, Christ’s name P. pro- 
ductum is that which must now be given to it, here and 
in Java. 
It is very evident, from Index 559 as quoted above, 
that Christensen meant to transfer Smith’s name. If it ad not 
chanced that Blume's generic name was Grammitis, which 
precedes Polypodium in an alphabetical arrangement. the 
transfer would have been clear from the start y 
art, and Christs 
name would hold. But this would be a very technical ruling 
