APPENDIX. 379 



5. DICHTYOSIPHONACE^;. Frond cyliiidric, branched, 

 filamentous in structure. Ovoid sporanges imbedded 

 lengthwise in substance of frond, opening by a pore on 

 the surface. 



1. Dictyosiphon. JRoot a minute naked disk. Frond 

 cylindric, branched. Oosporanges irregularly scattered, 

 solitary or in dotlike sori. 



2. Striaria Oosporanges in transverse lines on surface of 

 frond. 



6. PUNCTARIACE.E. Frond cylindric or flat, unbranched, 

 cellular. Ovate sporanges in groups on the surface, inter- 

 mixed with clavate filaments (paraphyses}. 



1. Punctaria. Frond flat and leaflike. Sporanges scat- 

 tered or iii sori. 



2. Asperococcus. Frond membranous, tubular, cylin- 

 dric, or compressed. Sporanges in dotlike sori. 



3. Litosiphon. Frond cartilaginous, filiform, subsolid. 

 Sporanges scattered, almost solitary. 



7. SPOROCHNACE.E. Frond leathery or membranous, 

 cellular, branched. Unilocular or multilocur sporanges at- 

 tached to external jointed filaments, free or collected in 

 knoblike masses. 



* Sporanges on pencilled filaments issuing from the 

 branches (Arthrocladiese). 



1. Demarestia. Frond solid or flat, dichotomously 

 branched. 



2. Arthrodadia. Frond traversed by a jointed tube, 

 filiform, nodose. 



3. Stilophora. Frond filiform, tubular or solid, branched. 

 Sporanges from necklace-shaped filaments in wartlike 

 groups on the frond. 



* * Sporanges in knoblike receptacles composed of 

 whorled filaments (Sporochnese). 



4. Sporochnus. Receptacles lateral on short peduncles. 



