Glossary and Index. 113 



Marsiliacese, (named for Aloysius Marsili, an Italian botanist), the pepperworts, 

 5f), 104. 



Midvein, the middle or main vein of a frond, pinna, pinnule, or segment. 



Monoecious, (Gr. monos, single, and oikiat house), bearing the male and female 

 organs on different parts of the same plant. 



Moonwort. Vide Botrychium. 



Morphology, (Gr. morplie, form, shape, and logos, a discourse), that department of 

 biology treating of the form of organisms, 26. 



Mucronate, {mucro, a sharp point), having the midvein prolonged beyond the pin- 

 nule, forming a sharp point. 



N. 



Nephrodium Vide Aspidium. 



Nephrolepis, (Gr. Tiephros, a kidney, and lepis, a scale), a tropical and sub-tropical 

 genus containing 7 species. 93; also 21, 34, 63. 



Nomenclature, 45. 



Notholaena, {nothus, spurious, and Isena, a cloak, alluding to the rudimentary in- 

 dusia; NotJwclsena, has the better etymology), resembling Cfieilantfies in habit and dis- 

 tribution ; contains 35 species. 70; also 21, 26, 30, 36*, 43, 61. 



O. 



Oak-fern. Vide Phegopteris. 



Oblong, from two to four times as long as broad. 



Obovate, (06, reversed, and ovum, an egg), inverted ovate. 



Onoclea, (Gr. OTios, a vw^el, and kUiein, closed, alluding to the fertile fronds). In- 

 habiting cold temperate regions and containing 3 species. 94; also IS, 20, 27, 34, 63. 



Oophore, (Gr. oon, an egg, and pAerem, to carry), the same as sexual generation, q.v, 



Oosphere, (Gr. oon, an egg), the female element of Cryptogams. 38. 



Oospore, (Gr. oon, an egg, and spores, a. seed), the fertilized oosphere. 38. 



Ophioglossaceae, 29, 40, 4ii, 05. 



Ophioglossum, (Gr. opAis, a serpent, and grZossa, a tongue), containing 10 species. 

 99; also 21, 35, 65. 



Orbicular, (orbiculits, diminutive of orbis, a circle), circnlar. 



Orders, 48. 



Osmunda, (from Osmunder, a Saxon name for the divinity, Thor.), u. genus of 6 

 species mostly north temperate. 98 ; also 20, 29*, 35, 64. 



Osmundaces, 29,64. 



Ostrich-fern. Vide Onoclea. 



Ovate, {ovum, an egg), having the form of the longitudinal plane of an egg with the 

 base downward. 



Ovoid, (ovum, an egg, and Gr. eidos, form), having the form of an egg. 



P. 



Palmate, (pcUma, the hand), with the divisions spreading from the end of the stalk 

 like the lingers of the hand. 



Panicle, (panicida, a tuft on plants), an open cluster, consisting of more or less 

 branching stems bearing fruit. 



Papyraceous, {papyrus, paper reed), having the texture of paper. 



Pedicel, (pedicuhts, diminutive of pes, foot), the stalk of a sporangium. 



Pellsea, (Gr. peUos, dusky, alluding to the dark colored stipes), closely allied to 

 ClieiXanthes, in habit and distribution; contains 55 species. 79; also 19, 21, 31*, 62. 



Peltate, (pelta, a small shield), shield-shape ; said of an indusium borne on a stalk 

 attached at its centre. 



Pentagonal, (Gr. penta, five, and gonla, angle), having five sides. 



22— 



