XXX SYNOPSIS OF THE SPECIES. 



LXXXIV. GRIFFITHSIA. 



* Branches set with short ramelli. 



240. equisetifolia j stems robust ; branches whorled throughout with closely im- 

 bricated, incurved, many times forked ramelli. (Tab. LXYII.) 



241. simplicifilum j stems slender, irregularly branched, whorled with imbri- 

 cated, straight, once-forked ramelli. (Tab. CCLXXXVIL) 



242. barbata; dichotomous, slender; upper articulations emitting opposite or 

 whorled, bvssoid, dichotomous, short ramelli, to which the tetraspores are 

 attached; favellae stalked. (Tab. CCLXXXI.) 



* * Stems dichotomous, naked. 



243. Devoniensis; very slender, flaccid, dichotomous, the lower axils wide, the 

 upper very acute; articulations cylindrical, 7-8 times as long as broad; 

 involucres of tetraspores whorled round the dissepiments of the branches. 

 (Tab. XVI.) 



244. corallinaj dichotomous, gelatinous ; articulations pear-shaped, the idtimate 

 ellipsoid; involucres sessile, those with tetraspores whorled round the 

 branch, with favellse lateral. (Tab. CCXIV.) 



245. secundiflora j filaments ultra-setaceous, irregularly dichotomous; axils 

 acute ; branches fastigiate, obtuse, not tapering ; articulations cylindrical, 

 2-4 times as long as broad, with a very wide border. (Tab. CLXXXV.) 



246. setaceaj filaments setaceous, straight, rigid, di-trichotomous ; axils very 

 acute ; branches gradually attenuated to a point ; articulations cylindrical, 

 5-6 times as long as broad ; involucres, of both kinds, pedunculate, lateral. 

 (Tab. CLXXXIV.) 



LXXXV. WEANGELIA. 



247. multifidaj stems setaceous, jointed, pinnate or bipinnate ; ramuli opposite 

 or whorled, pinnato-multind. (Tab. XXVII.) 



LXXXVI. SEIKO SPORA. 



248. Griffithsiana. (Tab. XXI.) 



LXXXVU. CALLITHAMNION. 



* Ramuli opposite. 



249. Plumulaj stems dichotomous, articulated ; each articulation bearing a pair 

 of short, recurved plumules, pectinated on their upper margin. (Tab. 

 CCXLII.) 



250. cruciatum; densely tufted, subdichotomous, articulate ; branches furnished 

 at each joint with two or four, opposite or quaternate, short, pinnated ra- 

 muli; tetraspores elliptical, at the base of the ramuli. (Tab. CLXIV.) 



251: floccosumj capillary, very flaccid, remotely branched; branches alternate, 

 articulated, every joint bearing a pair of minute, opposite, spine-like ramuli ; 

 tetraspores elliptical, pedicellate. (Tab. LXXXI.) 



252. Tumeric filaments rising from creeping fibres, simple or compound, once 

 or twice pinnated with opposite, spreading ramuli; articulations of the 

 main filaments* 5-10 times as long as broad; tetraspores clustered, ra- 

 cemose or corymbose; favellse involucred, stalked. (Tab. CLXXIX.) 



253. barbatumj irregularly branched ; brandies alternate, subsimple, naked, or 

 pinnulated with minute, opposite, spine-like ramuli; articulations twice as 

 long as broad. (Tab. CLXV.) 



