Glossary and Index. 115 



Scolopendrium, (Gr. skolqperidra, a centipede, alluding to the position of the sort,) ^ 

 coiitaina 5 species. 86; also 18, 20, 33* 36, 42, 63. 



Segment, one of the divisions of a pinnatifid frond. 



Selaginellaceae, )diminutive of Selago tlie ancient name of a club-moss), 50, 103. 



Sensitive-fern. Vide Onoclea. 



Serrate, {serra, a saw), having the margin cut into teeth pointing forward. 



Sessile, (sedere, to sit), without a stalk or petiole. 



Sexual Generation, the growth of the prothallium from the epore producing the 

 sexual organs, archegonia and antheridia, 37. 



Shield-fern. Fide Aspidium. 



Sigillariaceae, an extinct order of plants allied to the club-mosses, 50. 



Sinuate, (smtiS, a bending), having the margin alternately bending inward and 

 outward. 



Sinus, (Lat a bending), a recess or bay; the re-entering space between two lobes. 



Sorus, (plu. sori) (Gr. soros^ a heap or cluster), the clusters of fruit in the Poly- 



PODIACEJE. 



Spatulate, {spatula, a little spoon), shaped like a spatula. 



Species, 46. 



Specific Nannes, 45. 



Spinulose, {spina, a thoni), thorny. 



Spleenwort. Vide Asplenium. 



Spore, (Gr. ^oroSy a seed), the fruit of the higher cryptogams, produced asexnally, 

 28 ; Structure of, 36 ; Number of, 36. 



Sporangium, )plu. sporangia) (Gr. sporos, a seed, and aggeUm, a vessel), the case 

 or capsule enclosing the spores, 28. ' 



Sporophore, (Gr. sporos, seed, and ph&'ein, to carry), the same as asexual genera- 

 tion, q. V, 



Stellate, {Stella^ a star), star-shaped. 



Stipe, {stipes, a stock), the stem of a frond, 26, 42. 



Stoma, (plu. stomata) (Gr. a mouth), the breathing pores of plants, 43. 



Stramineous, (sfo'amen, straw), straw-colored. 



Struthiopteris. Vide Onoclea. 



Sub- (as a prefix), about, nearly, somewhat. 



Sub-Orders, 48. 



Superior, higher, applied to indusia that are attached above the sorus as in As'pid- 

 ium. 



Synonymy, 46. 



T. 



Ternate, (iemi, three each), branching into three nearly equal divisions. 



Thallogen, (Gr. tJmllos, a young shoot, and gennan, to produce), a group of crypto- 

 gams including the lichens and fungi, 48. 



Thalloid, (Gr. thallos, a young shoot, and eidos, form), having the form of a thal- 

 logen. 



Tissues, 41. 



Tomentose, {tonientum, a stuffing of wool), covered with densely matted woolly 

 hairs. 



Tomentum, (Lat. a stuffing of wool), the dense matted woolly hair found on some 

 ferns as many species of CheiMnthes. 



Tribes, 47. 



Trichomanes, (Gr. trichomanes, the name of some fern, from thrix, hair, and 

 TTUiinomai producing frenzy, alluding to some supposed property), tropical or temperate, 

 contains 91 species, 96; also 21, 29* 35*. 



