132 CLASS XXII. ORDERS IV and V. 



smooth, reticulate obtuse, cleft at tips — natant] 

 frond obcordate flat with long corapressed radicles. 



Order IV. Algae. 



Fucus. Germs imbedded in the gelatinous sub- 

 stance of the frond, aggregate : seeds produced in 

 clustered tubercles, which burst at their summits. 

 57. 2 — edulisf (dying seaweed) frond a roundish 

 short stem expanding into a wedge obovate obtuse 

 succulent leaf. An excellent vermifuge. (See 

 Doct. A. R. Griffin's inaugural dissertation, before 

 the New-York college of physicians.) 



Ulva. Frond membranaceous or gelatinous : 

 fruit in semi-transparent vesicular membranes 

 within the substance or under the general cuticle 

 of the frond, either solitary or clustered. 57. 2 — 

 purirureay (seaweed) lance-oblong, flat, margin 

 wavy entire. 



Conferva. Consisting of herbaceous tubes or 

 fibres, generally separated within by transverse 

 partitions : seeds scattered through the joints, or 

 contained in solitary closed tubercles attached to 

 the tubes or fibres. 57. 2 — nitida^ (green -hair, 

 frog's spittle) filaments simple lubricous shining, 

 joints cyVm^nc—Jluviatilis^ (brook green-hair) fila- 

 ments branched alternately. 



Order V. Lichenes.! 



A. Recefitacle none ; ^irofia^o naked y scattered or 

 aggregate. 



Lepraria. Efflorescence sub-globular, scatter- 

 ed loosely over a crustaceous base, which it often 



J This order is wholly copied from the system of Achari- 

 r.s, translated by Doct. Smith. Acharius has since subdivid- 

 ed Parmelia, Baemyces, 8cc. by giving generic names to the 

 sections of species. Sprengel says, these three fii'st genera 

 ;are merely the first rudijttKats of olher genera, and should 

 be rejected. 



