792 Rhodomele^. 



TRIBUS 2. POLIEXFEME^ fronde plana tota continua sub- 

 flabellato-areolata, nempe cellulis majoribus areolas con- 

 stituentibus subflabellatim dispositis (nec in zonas transver- 

 sales conjunctis). 



Sphcerosporis in parte frondis plerumque fenestrata evolutis. 

 Frons flabellato-laciniata avenia CXXVIII. Martensia. 



Sph(Erosporis in sticMdiis propriis. 



Frons dichotomo-laciniata ecostata venosa . CXXIX. Pollexfenia. 

 " " pinnatifida costata CXXX. Jeanneretti.^i. 



IIudLS o. ALSIDIE/Li fronde articulata aut inferne mox cor- 

 ticata extus faseiata, cellulis pericentralibus hic illic in- 

 sequilongis, ab exterioribus diametro parum diversis, 



* S]}hcerosporis in articulo singulis, linea spirali per pnrtem 



fructigeram superpositis. 



f Sphesrosporis in ramo vix mutato evolutis. 



Frons filiformis laxe ramosa CXXXI. Alsidium. 



" teretiuscula, ramulis densis circum- 

 circa horrida , CXXXII. Digenea. 



ff Sphcerosporis in stichidiis axillarihus. 



Frons compressa aut angulata 2-4 fariam 



ramulosa CXXXIII. Bryothamnion. 



** Sx>harosporis in articulo plurihus verticillatis. 

 Frons filiformis, articulata aiit fasciata . . . CXXXIV. BosTitYcmA. 



*** Sphcerosporis in parte fructigera hifariam seriatis (in arti- 

 culo geminis oppositis, (juasi interjecta costa separatis). 



f Sphcerosporis in ramulo vix mutato evolutis. 

 Frons filiformis aut compressa CXXXV. Rhodomela. 



ff Sphcerosporis in stichidiis propriis. 

 Frons plana inferne costata CXXXVI. Odonthalia. 



TRIHUS 4. POLYSIPIIOIVIE^E fronde filiformi polysiphonia 

 aut complanata et transverse zonata, nuda aut sursum plus 

 minus corticata, cellulis pericentralibus regulariter e regione 



