SYNOPSIS OF THE SPECIES. XV 



27. saccharinaj stem filiform, solid, expanding into a cartilagineo-coriaceous, 

 lanceolate frond. (Tab. CCLXXXIX.) 



28. Phyllitisj stipe short, subcompressed, gradually expanding into a linear- 

 lanceolate, delicately membranous, undivided frond. (Tab. CXCII.) 



29. Fascia j stipe very short, setaceous, ending in a membranaceous, wedge- 



shaped or lanceolate frond. (Tab. XLV.) 



XIII. CHORDA. 



30. filum; frond filiform, very long, not constricted at the joints. (Tab. CVII.) 



31. lomentariaj frond membranous, constricted at distant intervals, the in- 

 terstices inflated. (Tab. CCLXXXV.) 



Order 4. DICTYOTACEJ: 



XIV. CTJTLERIA. 



32. multifida j polymorphous, flabelliform, irregularly cleft ; laciniae acute, at- 



tenuate. (Tab. LXXV.) 



XV. HALISERIS. 



33. polypodioides -, frond dichotomous, entire ; spots of fructification linear, dis- 

 posed along the midrib. (Tab. XIX.) 



XVI. PADINA. 



34. Pavonia. (Tab. XCI.) 



XVII. ZONARIA. 



35. collarisj procumbent, coriaceous, attached by the under surface; upper 

 surface emitting cup-shaped, membranaceous, orbicular fronds, fringed 

 round the margin. (Tab. CCCL1X.) 



36. parvulaj procumbent, attached by fibres from the Lower surface, membra- 



naceous, variously lobed ; lobes free, rounded. (Tab. CCCXLI.) 



XVIII. TAONIA. 



37. atomaria; frond broadly wcdijv-shaped, deeply and irregularly cleft longitu- 



dinally; spores in wavy transverse lines, with intermediate scattered spores. 

 (Tab. I. Diclyota aiomaria.) 



XIX. DICTYOTA. 



38. dichotomaj frond regularly dichotomous, the upper segments narrower. 

 (Tab. C1I1.) 



\\. STILOPHORA. 



39. rhizodes ; subsolid, much and irregularly branched ; the leaser divisions 



dichotomous, attenuated ; wart-like fructification densely covering the 

 branches and ramuli. (T lb. LXX.) 



40. Ijyngbyaei; frond tabular, di-tended, dichotOmOUS, with rounded axils, 



much attenuated np wards; ramuli forked, capillar); sori Bubdistant, in 

 transverse lines. (Tab. ((WW l l.t 



\\1 DICTYOSIPUON. 

 11. famiculaceus. (TAB, I I CXXV1 > 



