ALG.E. 255 



forming definite sori in the frond, or in distinct foliaceous leaf- 

 lets. Grev. 



25. Nitophyllum. Frond plane, delicately membranace- 

 ous, rose-coloured, reticulated, wholly without veins or only 

 with very slight vague ones towards the base. Fructification ; 

 hemispherical capsules, imbedded in the substance of the frond ; 

 and ternate granules, forming distinct scattered spots. Grev. 



26. Rhodomenia. Frond plane, membranaceous, fine pink 

 or red, quite 4 veinless, sessile, or with a short stem which ex- 

 pands immediately into the frond. Fructification ; hemispheri- 

 cal scattered capsules; and minute ternate granules, spreading 

 over the whole or some part of the frond, (not in defined spots.) 

 Grev. 



27. Plocamium. Frond filiform, compressed, between mem- 

 branaceous and cartilaginous, fine pink-red, much branched, 

 branches distichous (alternately secund and pectinate). Fruc- 

 tification : spherical, sessile capsules; and lateral minute pro- 

 cesses, containing oblong granules, transversely divided into 

 several parts by pellucid lines. Grev. 



28. Microcladia. Frond filiform, compressed, subcartila- 

 ginous, irregularly branched, the branches distichous. Fructi- 

 fication ; sessile spherical capsules, accompanied by an involucre, 



in the form of several short ramuli; and ternate granules, in the 

 swollen apices of the branches. Grev, 



29. Odontiialia. Frond plane, between membranaceous 

 and cartilaginous, dark vinous-red, with an imperfect or obso- 

 lete midrib, and alternately toothed at the margin. Fructifica- 

 tion marginal, axillary or in the teeth : — capsules containing 

 pear-shaped seeds, fixed by their base ; and slender processes 

 containing ternate granules. Grev. 



30. Rhodomela. Frond cylindrical or compressed, filiform, 

 much branched, coriaceo-cartilaginoua (the apex sometimes in- 

 volute). Fructification} subglobose capsules, containing free 

 pear-shaped seeds ; and pod-like receptacles with imbedded ter- 

 nate granules. Gn r. 



SI. Bonnemais6nia. Frora? membranaceous, compressed or 

 plane, filiform, mncb branched, the branches pectinate with 

 distichous cilise. Fructification; sessile or pedicellate «m- 

 sules, containing a cluster of pyrifbrm (compound ? ) seeds, fixed 

 by their base. Gtk v. 



Laur&ncia. Frond cylindrical, filiform, between car- 

 tilaginous and gelatinous, mostly yellowish or purplish-red* 

 Fructification of two kinds: <>\;itr capsules, with a terminal 

 pore, containing a cluster of stalked pear-shaped seeds, fixed by 

 their base; nnd ternate < r imbedded in the ramuli Grev, 



