Glossary 



301 



Parasite, a plant that lives on or in 

 some other organism from which 

 it derives its nourishment for the 

 whole or a part of its existence 



Parenchyma, the soft, thin-walled cel- 

 lular tissue of plants 



Pedicel, a small or delicate supporting 

 stalk 



Pedicellate, stalked 



Pellucid, clear 



Penicillate, like a brush 



Periphery, edge 



Phycocyanin, a blue pigment con- 

 tained in the chromatophores of 

 the blue-green algae 



Pigment spot, a specialised mass of 

 cytoplasm permeated by a red col- 

 oring matter, present in the mo- 

 tile cells of many algae; eye-spot 



Piliferous, bearing hairs 



Pilose, hairy 



Plant, in the coccogoneae a single cell; 

 in the hoemogoneae a single trich- 

 ome " ' 



Plant mass, the usually shapeless mass 

 of individual plants remaining in 

 close proximity to each other 

 after their formation, either be- 

 cause nothing occurs to separate 

 them or because they are definite- 

 ly held together by a gelatinous 

 excretion 



Plicate, folded or ridged 



Polar, at the end 



Polygonal, many-sided 



Polyhedral, many-angled 



Polymorphous, of many forms 



Proliferated, grown out 



Protoplasm, the viscid, contractile, 

 semiliquid, more or less granular, 

 substance that forms the principal 

 portion of an animal or vegetable 

 cell 



Prostrate, flat, lying down 



Pseudo-parenchymatous, like paren- 

 chyma 



Pubescent, finely hairy 



Pulverulent, powdery 



Pulvinate, cushion-like 



Punctate, dotted 



Punctiform, dot-like 



Pustular, like a swelling 



Pyrenoid, a small colorless mass of 

 proteid substance seen in many 

 algae, which may be regarded as 

 reserve material 



Quadrate, square, in fours 



Radial, pertaining to a radius, as of 



a circle or sphere 

 Rectilinear, straight 



Refractive, refringent, bending or 

 turning aside as a light ray 



Reniform, kidney-shaped 



Reproduction, the development of one 

 or more new organisms from the 

 whole or from a part of the pro- 

 toplasm of a parent organism 



Rotund, round 



Rugose, furrowed, roughened 



Saccate, sack-like 



Segment, one of the parts into which 



an object is naturally divided 

 Septate, divided by partitions 

 Seriate, in a row 

 Sessile, without a stalk 

 Sheath, a gelatinous, usually tubular, 



envelope surrounding a plant 

 Silicious, containing silica 

 Sinuate, snake-like, twisted 

 Sinus, a gulf or indentation 

 Spatulate, shaped like a spoon 

 Spherical, ball-like 

 Spongiose, spongy 

 Stellate, star-like 

 Stratified, in layers 

 Stratum, a layer 

 Striated,' having fine markings 

 Sub, slightly, somewhat 

 Submerged, sunken 

 Substratum, surface on which the 



plant grows 

 Superposed, placed one above another 



Tegument, covering 



Tenacious, firm, tough 



Terebriform, screw-like 



Terminal, end 



Terrestrial, growing on the ground 



Thallus, a plant-body without true 

 root, stem or leaf; used incorrect- 

 ly instead of "plant mass" 



Tomentose, closely hairy 



Tortuous, twisted 



Torulcse, chain-like 



Trichome, the entire number of cells 

 of a multicellular plant, not in- 

 cluding the sheath 



Truncate, cut off abruptly 



Tuberculate, tuberculose, warted 



Tubular, tube-like 



Ultimate, last, end 

 Uncinate, hooked at the end 

 Undulate, wavy 

 Unicellular, one-celled 

 Unilateral, one-sided 



Vacuole, a cavity in the protoplasm 

 of a cell containing a watery 

 fluid 



