POLY TAXIS 



Classification and chief genera (after Engler) : 



1. Woodsieae (sori term, or dorsal; indusium inf., extrorse or 



opening every way; spores bilate'ral) ; Woodsia, Cystopteris, 

 O noc lea. 



2. Aspidieae (sori usu. on backs of nerves; indusium sup. oro;- 



spores bilateral ; 1. usu. unjointed) : Dryopteris, Polystichum. 



3. Oleandreae (sori as in 2 ; indusium kidney-shaped, oblique; 



spores kidney-shaped ; 1. divided) : Oleandra. 



4. Davallieae (sori on or near edge of a segment, with extrorse 



indusium) : Nephrolepis, Lindsaya, Davallia. 



5. Asplenieae (sori long or linear, unilat. along fertile nerves, with 



lat. indusium) : Blechnum, Asplenium, Scolopendrium. 



6. Pterideae (sori usu. long, term, or along fertile nerves; usu. 



without indusium, or edge of 1. rolled back): Gymnogramma, 

 Cheilanthes, Adiantum, Pteris, Pteridium. 



7. Vittarieae (sori at edge or on nerves || midrib; 1. unjointed): 



Vittaria. 



8. Polypodieae (sori usu. roundish at end of a nerve ; dead 1. falling 



completely and leaving a scar): Drymoglossum, Polypodium, 

 Cyclophorus, Drynaria. 



9. Acrosticheae (lower side of L, in whole or part, covered with 



sporangia; no indusium) : Elaphoglossum, Platycerium. 



Polypodiopsis Carr. Coniferae (Taxaceae). i New Caledonia. 



Polypodium L. (incl. Granrmitis, Pleopdtis, Selligitea, &c.). Polypo- 

 diaceae. 600 cosmop. P. viilgare L. (polypody) in Brit. They have 

 circular naked sori. Many trop. sp. are epiph., e.g. P. Heraclenm 

 Kze. The rhiz. creep over the supporting tree, and humus is col- 

 lected in niches formed between it and the 1. [P. Dryopteris L. 

 (oak fern ) = Dryopteris Linneana C. Chr.; P. Phegopteris L. (beech 

 fern) = D. Phegopteris C. Chr.; P. qmrcifolium C. = Drynaria querci- 

 folia T- Sin.] 



Polypogon Desf. Gramineae (8). 10 warm temp, and trop. ; 2 in Brit, 

 (beard-grass). 



Polypompholyx Lehm. Lentibulariaceae. 3 trop. Austr., S. Am. 



Polyporandra Becc. Icacinaceae. 3 Malay Archipelago. 



Polypremum L. Loganiaceae. i N. Am., W.I., Colombia. 



Polypteris Nutt. (Palafoxia EP.). Compositae (6). 6 S.W. U.S., 

 Mex. 



PolyrrMza Pfitz. Orchidaceae (n. 20). 4 W.I. 



Polyschistis J. et C. Presl. Gramineae (n). i Phil. Is. 



Polyscias Forst. Araliaceae (i). 80 palaeotrop. 



Polysolenia Hook. f. Rubiaceae (i. 7). i Khasias. 



Polyspatha Benth. Com'melinaceae. i W. trop. Afr. 



Polysphaeria Hook. f. Rubiaceae (n. i). 7 E. trop. Afr. 



Polystachya Hook. Orchidaceae (11.5). 75 Afr., trop. As., Am. 



Polystemma Decne. Asclepiadaceae (n. 4). 2 C. Am., Mexico. 



Polystemonanthus Harms. Leguminosae (n. 3). i Liberia. 



Polystichum Roth. Polypodiaceae. 112 cosmop. P. aatleatum (L.) 

 Schott (prickly shield fern) Brit. 



Polytaenia DC. Umbelliferae (in. 6). i N. Am. 



Polytaxis Bunge (Jurinea BH.}. Compositae (i i). i Turkestan. 



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