SYMPHYOSIPHON. 261 



SYMPHYOSIPHON AUSTINII, Wood. 



Growing on rocks, stratum tomentose, and somewhat 

 turfy, brownish-black ; trichomes ascending, mostly simple, 

 curved ; internal filament dull aeruginous, or more fre- 

 quently fuscous, articulate or inarticulate, sometimes thick- 

 ened at the ends (indicating a vegetative condition) ; articles 

 much shorter to slightly longer than the diameter. Sheaths 

 reddish or yellowish fuscous, at the apex often colorless and 

 transparent, firm ; surface smooth or rough ; heterocysts 

 shortly cylindrical, subquadrate or subglobose, sometimes 

 much compressed. 



Diameter of filaments, 15-20 //. 



Occurs in blackish strata, a line, more or less in thickness, 

 forming a sort of miniature turfy cushions upon rocks. 

 Pennsylvania and New Jersey. 



Plate CLXXXIX, fig. 5, a few filaments separated from a 

 cluster. 



SYMPHYOSIPHON BORNETIANUM, Wolle. 



Forms a thin, dark, reddish brown stratum on clay soil, 

 old bricks and the like, surface smooth ; filaments and 

 branches a close upright growth ; filaments short, thick ; 

 articulations one-half as long as the diameter, or somewhat 

 longer or shorter. Internal trichomes brown, or slightly 

 aeruginous ; sheath close ; heterocysts yellowish, interjected. 



Diameter of filaments, 12-15 yw. 



Possibly a young form, or arrested growth, but have not 

 been able to trace it beyond the present condition. 



Plate CLXXXIX, fig. 4, from specimens on old bricks, 

 Port Royal, South Carolina; fig. 6, from clay cliffs, South 

 Carolina. 



SYMPHYOSIPHON HIRTULUS, Kg. 



Stratum somewhat extended, pulvinate, olivaceous-black, 

 consisting of small, erect wick-like bundles of filaments 

 agglutinated below, free at the ends. Sheaths distinct; 

 trichomes aeruginous ; articulations about as long as wide. 

 Sheaths colorless or yellowish, smooth when young, be- 

 coming granularly rough with age. Heterocysts single or 

 twin. Somewhat oblong, light brown or colorless. 



Diameter of filaments, with sheaths, 8-10 //, and about 

 10-15 /J. with sheaths. 



Moist rocks, damp earth, etc. 



