418 ETYMOLOGY. 



Ophioglossom, ophios, of a serpent, glossa, tongue ; the spikes 



of fructification. 



Ormopteris, ormos, a necklace, pteris; the form of fronds. 

 Osmunda, Osmunder, one of the names of Thor, a Celtic 



divinity. 



Paragramma, para, near to, gramma, a line ; the sori in 



short lines parallel with and close to the margin. 

 Pellsea, pellos, dark-coloured ; the dusky colour of the fronds. 

 Pelleeopsis, Pellcea-opsis, like ; like pella3a. 

 Peranema, peri, around, nema, a thread ; the sori born on a 



slender thread like stalk. 

 Phegopteris, pliegos, beech ; beech Fern, by some called 



Sun Fern. 

 Phlebodium, pJilebes, veins, odous, a tooth ; the joining of 



the veins in the areoles being like teeth. 

 Photenopteris, pJioteinos, shining, pteris; shining Fern. 

 Phym&todes, phymata, tubercles ; the impressed sori having 



the appearance of tubercles on the upper side of the 



frond. 



Phymatopsis, Phymatodes, opsis, like ; like Phymatodes. 

 Plagiogyria, plagios, oblique, gyros, a circle ; the obliquity 



of the ring of the sporangia. 

 Platycerium, platys, broad, keras, horn ; the fronds divided 



in broad segments like stags' horns. (The Stags'- 



horn Fern). 

 Platyloma, platys, broad, loma, border ; having broad sori 



close to the margin. 

 Platyzoma, platys, broad, zoma t a band ; the ring of the 



sporangia broad. 



Plecosorus, plektos, plaited ; relating to the form and posi- 

 tion of the sori. 



