GLOSSARY ANI) INDkX. 



Mesbzoic Age, Pteridophytes of, 



66. 

 Micro (Gr. iicp6?, small), (as a prefix) 



small. 

 Midvein, the middle or main vein of 



a frond, pinna, pinnule, or segment. 

 Mimicry, 3. 

 Monoecious (Gr. MO-OS, single, and 



OCKOS, house), bearing the male and | 



female organs on different parts of i 



the same plant. 

 Moonwort. Vide Botrychi- 



um. 

 Mucronate (Lat. mucro, a sharp 



point), having the midvein prolonged 



beyond the pinnule, forming a sharp 



point. 

 Musci (mosses), 52. Literature of, 



61. 

 Myxomycetes, 51. Literature 



of, 57. 



N 



Nephrodium. V. Dryopteris. 

 Nephrolepis, 117; also 5, 16, 7 8. 

 Nomenclature, 4. 

 Notholsena, 85; also 6, 9, 13, 76. 



Oak-fern. Vide Phegopteris. 

 Oblong, from two to four times as 



long as broad. 

 Obovate (Lat. 06, reversed, and 



o-'uw, an egg), inverted ovate. 

 Onoclea, 119; also 2, 3, 5, 10, 17, 66, 



72, 7 8. 

 Oophyta (Gr. wo^, an egg (spore), 



and <J>VTOV, plant). 

 Oosphere (Gr. <iov, an egg), the 



female element of Pteridophytes. 

 O OS pore (Gr. wor, an egg, and 



<nrop6?, a seed), the fertilized oo- 



sphere. 

 Ophioglossaceae, 128; also 28. 



Literature of, 31. 



Ophioglossum, 128; also 6, 29, 30. 



Orbicular (Lat. orbiculus, diminu- 

 tive of orbis, a circle), circular. 



Orders, 45- 



Osmunda, 174: also 2 > 3 4. 5. 6, 18, 

 19. 80. 



Osmundacese, 12, 79. 



Ostrich-ferni Vide Onocleai 



Ovate (Lat. ovum, an egg), having 



the form of the longitudinal plane of 



an egg with the base downward. 



Ovoid (Lat. ovum, an egg, and Gr. 



I6<K, form), having the form of an 



Paleaceous (Lat. palea, chaff), 



clothed with chaffy hairs. 

 Palmate (Lat. palma, the hand), 



with the divisions spreading from the 



end of the stalk like the fingers of the 



hand. 

 Panicle (Lat. panicula, a tuft on 



plants), an open cluster, consisting of 



more or less branching stems bearing 



fruit. 

 Papillose (Lat. papilla, a nipple), 



bearing minute nipple-like projec- 



tions. 

 Papyraceous (Lat. papyrus, paper 



reed), having the texture of paper. 

 Pedicel (Lat. pediculus, diminutive 



of pes, foot), the stalk of a sporan- 



gium. 



Pellsea, 97; also 2. 3, 6, 14, 77. 

 Peltate (Lat. pelta, a small shield), 



shield-shape; said of an indusium 



borne on a stalk attached at its centre. 

 Pentagonal (Gr. ireVre, five, and 



yuu't'a, angle), having five sides. 

 Perisporiacese, 52. Literature 



of, 60. 

 Peronosporeae, 51. Literature 



of, 57- 

 Petiole (Lat. /*//<?/.?, diminutive of 



pes, foot), the stalk of a pinna or 



pinnule. 

 Phegopteris, 108; also 5, 9, 16, 27, 



78. 



Pilose (Lat. pilus, hairy), covered 



with soft hairs. 

 Pilularia, 126; also 39, 6g. 

 Pinna (Lat. a feather), the primary 



division of a compound frond. 

 Pinnate (Lat. pinna, a feather), hav- 



ing the divisions of the frond ar- 



ranged on the two sides of a common 



rachis. 

 Pinnatifid (Lat. pinna, a feather 



