248 



GLOSSARY. 



Pe'r-i-stome (irepi, around ; 0To/u.a, a 

 mouth). In mosses, usually bristle- 

 like or tooth-like structures surround- 

 ing the orifice of the capsule. 



Per-i the' ci-um, pi. perithecia 

 (wept, around ; 0JKtj, a- case). The 

 spore-vessel of certain carpophytes, 

 containing the spore-sacs (asci). 



Pe't-al (Tre'raAoi', a leaf). A corolla 

 leaf. 



Pe't-i-ole (petiolus, a little f oof). The 

 stalk of a leaf. 



Phan-e-ro-ga'-mi-a (<J>af epos, evident ; 

 yajw,os, marriage). A primary division 

 (the highest) of plants, named from 

 their mode of reproduction, the seed- 

 producing plants. Pha' n-e-ro-gam is 

 the English equivalent. 



Phlo'-em (</>Aot6s, the inner bark). 

 The bark or bast portion of a fibre- 

 vascular bundle. 



Phy-co-cy'-aii-ine (^UKOS, sea-weed; 

 KUO.I/OS, dark blue). A bluish coloring 

 matter extracted by water from cer- 

 tain algae. 



Phy'1-lo-tax-y (</>vAAov, a lea/; rafi?, 

 arrangement). Leaf -arrangement. 



Pi'n-na, pi. pinnae (pinna, a feather). 

 One of the primary divisions of a 

 pinnate leaf, as in ferns. 



Pi'n-nule (pinnula, a little feather). 

 One of the divisions of a pinna. 



Pi's-til (pistillum, a pestle). The fe- 

 male organ in phanerogams. 



Pit. A thin place, or pit-like depres- 

 sion, left in the thickening of a cell- 

 walk 



Pla-ce'n-ta, pi. placentae (placenta, 

 a cake). That portion of the ovary 

 which bears the ovules. 



Ple'-rome (TrArjpw/aa, that which fills). 

 A name given to that part of the mer- 

 istem near the growing points of the 

 plant-axis, which forms a central shaft 

 or cylinder and develops into the 

 axial tissues. 



Plu'-mule (plumula, a small, soft 

 feather). The terminal bud of the 

 embryo above the cotyledons. 



Pod. A dry, several-seeded, dehiscent 

 fruit; or a similar spore-case. 



Po'l-len (pollen, fine flour). The 

 spores developed in the anther. 



Pol-lin-a'-tion. The transfer of pol- 

 len to its stigma. 



Pro-einbryo (pro, before; embryo). 

 In phanerogams, the chain of cells 

 (suspensor) formed after fertilization, 

 and from the lower end of which the 

 embryo develops. 



Pro-tha'1-li -uin, pi. prothallia(pro, 

 before ; thallus, a young- shoot). In 

 pteridophytes, the small usually 

 short-lived plant which develops from 

 the spore, and bears the sex-organs. 



Pro-to-ne'-ma, pi. protone'inata 

 (TrpuiTo?, first ; JJjota., that ivhick is sent 

 out). In mosses, the filamentous, 

 growth which is produced by the 

 spores, and from which the leafy 

 moss plant is developed. 



Pro-to'pli-y-ta (TTPUJTOS, the first; 

 <f>vTov, a plant). A primary division 

 of plants, named from the fact that 

 they include the lowest known plants. 

 Pro'-to-phyte\?, the English equivalent 



Pro'-to plasm (7rpo>Tos, first ; 7rAot<r/u.a, 

 that which has been formed). That 

 substance in living cells, of varying 

 consistency, which is the seat of all 

 vital phenomena. 



Pte'r-i-doid (n-Tepis, a fern; elfios, 

 form). Fern like. 



Pter-i-do'pll-y-ta (irrepts, a fern; 

 </>uTOf, a plant). A primary division 

 of plants, named from its principal 

 group, the ferns. Pte-ri' d-o-pJiyte is 

 the English equivalent. 



Py'r-e-noid (irvp^v, kernel; eiSos. 

 form). Minute colorless bodies im- 

 bedded in the chlorophyll structures 

 of some lower plants. 



lla'pli-i-de* (pat/us, a needle; etfios, 

 form). Needle-like plant-crystals. 



Ke-ce'p ta-cle (receptaculum, a recep- 

 tacle). That portion of an axis or 

 pedicel (usually broadened) which 

 forms a common support for a cluster 

 of organs, in most cases sex-organs. 



Ke-ti'c-u-la-ted (reticulatus, net-like). 

 Having a net-like appearance. 



