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. 
Pellwa, pellos, dark-coloured ; the dusky colour of the fronds. 
Pellæopsis, Pellwa-opsis, like; like pellea. 
Peranema, peri, around, nema, a thread ; the sori born on a 
slender thread like stalk. 
Phegopteris, phegos, beech; beech Fern, by some called 
Sun Fern. 
Phlebodium, phlebes, veins, odous, a tooth; the joining of 
the veins in the areoles being like teeth. 
Photenopteris, photeinos, shining, pteris; shining Fern. 
Phymatodes, phymata, tubercles ; the impressed sori having S 2 
the appearance of tubercles on the upper side of the — ` 
frond. 
Phymatopsis, Phymatodes, opsis, like; like Phymatodes. 
Plagiogyria, plagios, oblique, gyros, a circle; the benim ? 2 i 
of the ring of the sporangia. PR 
Platycerium, platys, broad, keras, horn ; the fronds divided. : 
— 
. in broad segments like stags' horns. (The Stags- | e 
a horn Fern). 
S : .Platyloma, platys, broad, loma, border; having broad sori à 
. Close to the margin. io 
X. Platyzoma, platys, broad, zoma, a band ; the ring of the : 
s sporangia broad. uos 
= ?Plecosorus, plektos, plaited ; relating to the form. P v 
tion of the sori. je 
