304 BRITISH SEA-WEEDS. 



Pinnatifid, divided into lobes from the margin nearly to the 

 midrib. 



Pinnule, a secondary branchlet or leaflet. 



Pistil, the body in the centre of a flower which contains the 

 ovary, styles, and stigma. 



Placenta, that part of the capsule to which the spores or 

 spore-threads are attached. 



Plumulate, \ feathered 



Plumose, J 



Plumule, a feather-like branchlet. 



Pollen, the fertilizing powder contained in the cells of flower- 

 ing plants. 



Polysiphonous, many-tubed. 



Pore, a minute opening in the cuticle. 



Primary, of the first series. 



Process, a prominence, protrusion, or small lobe. 



Procumbent, spread on the ground, but not striking root. 



Produced, lengthened. 



Proliferous, producing leaflets or shoots from the tip or 

 margin. 



Punctate, dotted. 



Pyramidal, formed like a pyramid. 



Pyriform, pear-shaped. 



Quadrifarious, arranged in four or more rows. 



Racemose, having several conceptacles along a branchlet. 



Ramellus, the ultimate division of a branch. 



Ramus, a principal branch. 



Ramulus, a secondary branch. 



Receptacle, the vessel which contains the spores in the Olive 



series. 

 Rectangular, right-angled. 

 Recurved, 

 Reflexed, 



Reticulate, having a net-like structure or marking. 

 Rigid, stiff. 



' I bent downwards. 



