PTERIDIUM, J. AGARDH, A HOMONYM 243 
(Myrica, Linn., 1737 ane 1753.ll) 
VT (?) Raf., 1838,** not Cerophora, Raf., 
(Angeia, Tm., 1909.83) 
i 2. CEROTHAMNUS, Tm., 1909.88 
(M son rape 1903,11 not Morella, Lour., 1790.111) 
(Cero (2) Raf., 1838,** not Cerophora, Raf. 
a 
Department of Botany, 
The University of Notre Dame, Ind. 
Pteridium, J. Agardh, A Homonym. 
Jd. As NIEUWLAND. 
1 J. Agardh* in segregating Delesseria alata as the type of a 
: new genus, Pteridium from the other delesserias, seems to have 
forgotten that the name Pteridium had been used by Scopoli in 
17601, for the new genus founded on the Linnaean Pteris aqui- 
lina, or common bracken. The genus of Scopoli called Thelyp- 
teris before Linnaeus has lately become again recognized as a 
valid one, and it certainly seems to be entitled to distinct gen- 
eric standing from Pteris. Even Theophrastus accepted it as 
such and the name, Thelypteris, for the common bracken origi- 
— nated with him, a name which on the basis of absolute priority 
is the correct one. The custom of not accepting names prior to 
1753, however, has caused much confusion, and this is but a 
minor instance of the kind. Until 1753 be obragated as a 
Linnaeus, C., Genera Plantarum, no. 746, p. 302, (1737). 
Rafinesque, C. S., Medical Repository, p. 335, 
Tidestrom, I., Elysium Marianum, 1910, p. 37 
Loureiro, J. de, Flora Cochin-Chinensis, p. 548, (1790 
Small, J. K., green of the Southeastern United States, p. 337, (1903). 
i . Gen. Ord. Alg. Vol. 3, Pars. 3, p. 218. Genus 
3 ). 
t Sow J. A. Flora Carniolica, 1760, p. 169. 
