SECT. II. REPRODUCTIVE ORGANS. 



In the Fuel it is sometimes capillary or cylin- Fuci. 

 drical, and sometimes flat, with or without a mid- 

 rib, sometimes jointed like a neck-lace, and some- 

 times leafy and shrub-like, and interspersed with a 

 number of bags or bladders pellucid or opaque; 

 being wholly marine and generally known by the 

 appellation of sea-weed or sea-wrack, attaching 

 itself to rocks and stones on the sea shore, so as to 

 be laid bare at low water, but often also at such a 

 depth as to be constantly submersed. 



SECTION II. 



Reproductive Organs* 



THE fructification of the Algae is less perfectly Resemble 

 known than that cf any of the preceding tribes of * 

 imperfect plants, but it has received like them also 

 considerable elucidation from Hedwig, particularly 

 in as much as regards the Lichens. In all species 

 of lichen there issues from the edge or surface of 

 the frond a number of small tubercles, or wart-like 

 substances, of the colour and contexture of the 

 frond. If one of them is taken in an early stage of 

 its growth, and divided by means of a vertical 

 section, it will be found to consist of a single or 

 double cell imbedded in the pulp of the frond, and 

 containing a granulated mass. The contained gra- 

 nules are particles of pollen, the maturity of which 



