e 
i7. POLYSTICHUII Reth, 1890. 
floc genus Polystichum nominavt (ex verbis rorv 
mulium et ottxos ordo) guia fructificationum puncta 
plura tn ordines vel series ordinata plerumque obser- 
ventur. SLeoth, Fl. Germ. 3:69. 
Rootstock stout, very chaffy. Leaves pinnate, spinu- 
lose-serrate. Sori large. Indusium peltate. 
|. P. acrostichoides (L. C. Rich.) Schott. 
Liilix mas folits tntegris auriculatis Banister; 
Ray, Hist.. 1926. 
Poly podium fronde pinnata lanceolata, foltis lun- 
ulatts ciliato-serratts. Gron. F\. Virg. 123. 
Nephrodtum acrostichoides L. C. Rich.; Michx. 
207267. 
foe acrostichotdes Sw. Syn. Fil. 44. Eaton, 
Ferns N. Am. 1: 257. t. 34; in Gray Man. 689. 
Polystichum acrostichoides Schott, 1834. Gen. Fil. 
Underw. Nat. Ferns 115 ; in Britt. Man. 14. Clute 
Ferns 106. Waters, Ferns 244. 
Dryopterts acrostichotdes Kuntze, 1891. Revisio 
Gen. 2: 812. Underw. in Ill. Fl. 1: 14. 
CurisTMAS FErn. 
Plant 3—6 dm. high; leaves very chaffy below; pinnae 
2—8 cm. long, auricled on the upper side, oblong-lance- 
olate, spinulose-dentate ; upper pinnae fertile, reduced and 
ut length covered by the numerous sori. 
In dry, deciduous woods. 
The form P. acr. Schwetnitziz, having toothed or in- 
cised pinnae, has been ohserved by J. HY. Pacnuter at 
Cabin John, Md. 
38 
