128 UnpERWOOD: OuR GENERA 
POLYSTICHUM Roth, 
DrRyYopTERis Adans. 
THELYPTERIS, adopted for Aspidium Thelypteris (L.) Swz and its allies. 
MENISCIUM Schreb. 
Unfortunately Schott’s studies were not systematized and were 
cut short by his death; several of the above genera even appear 
only in his ‘‘ Observationes,” a series of notes appended to his 
discussions and illustrations of genera. 
It was Presl, however, who, in 1836,* commenced the process 
of generic expansion by founding a considerable number of new 
genera and adopting several older ones. His system was as follows° 
ASPIDIACEAE 
Nephrodiarieae Aspidiarieae 
LastrREA Bory.t PoLysTICHUM Schott. 
OLEANDRA Cav. PHANEROPHLEBIA Presl. 
NEPHROLEPIS Schott. CycCLoDIUM Presl. 
NEPHRODIUM Schott. CYRTOMIUM Presl. 
SAGENIA Presl. 
ASPIDIUM Schott. 
D1IDYMOCHLAENA Desv. 
Presl cites Schott for several genera earlier named, thus recog- 
nizing the fact that he was using them in a sense different from 
that of their original authors. 
Among his new genera was Phanerophlebia (p. 84) founded on 
P. nobilis (Schlecht.) to which must be joined Amélia (p. 184) 
which was founded on A. juglandifolia (H. & B.) on the miscon- 
ceived notion that this species had no indusium.{ 
Cyclodium (p. 85) was based on three species of the old world, 
of which C. glandulosum (Bl.) was first named, although C. ments- 
ctoides (Willd.) is perhaps better known. Cyrtomium (p. 85) was 
based on two old-world species, of which C. falcatum (L.) is Br 
only the first named but is the long known plant common 1? 
gore“ 
* Tentamen Pteridographiae. Prag, 1836. 
{ Lastrea contained three sections, the first of which was called Dryopterts but 
singularly did not contain the type species of Adanson’s Dryopteris (D. flix mas) 
which instead was placed in ¢ 7helyfteris. 
{John Smith carelessly remarks ( Historia Filicum, 204) ‘‘ these two ge 
evidently founded on specimens off which the indusium had fallen.’’ This is Aakers e 
Amblia but Presl (/. ¢.) says in establishing Phanerophlebia : ** Indusium orbiculare, 
peltatum.’’ It is not always safe to trust the statements of the ‘ authorities’’ 47¢ 
taking up fern names it is often as essential to know fern literature accurately a5 tee oe 
be familiar with growing ferns. S 
nera being 
