74 FRESH-WATER AhGAi OF THE UNITED STATES. 



coutortis; rauiulis abbreviatis vel noiinihil elongatis, apice obtuse rotundatis; ramulorum et 

 trichoiuatuiu cellulis tri-multiseriatis, plerumque pachydermaticis, ferrugineo-fuscis, enormiter 

 globosis, liomogeneis; cellulis apicalibus interduni breve cylindricis, baud articulatis; vaginis 

 sat aiiiplis, lutco-bruiiiieis vel dilute ferrugiueo-brunneis. 



Biam. — Max. trich. cum vag. ^l^" =.0013". 



Sijti. S. gutlula, Wood, Prodromus, Proc. Amer. Philos. Soc, 1869, p. 132. 



Zfo&.— South Carolina, in Tasodium distichum. (Prof. Ravenel.) 



Arranged in small, thin, black spots, which are generally round, but sometimes irregular : fila- 

 ments closely interwoven, very much branched, rigid, unequal, subcylindrical, somewhat con- 

 torted ; branches abbreviate or somewhat elongate, apex obtusely rounded ; cells of the 

 trichoma and branches 3 to many seriate, mostly with thick coats, ferruginous-fuscous, irregu- 

 larly globose, homogeneous ; apical cells sometimes shortly cylindrical, not articulate, sheaths 

 ample, yellowish-brown. 



Remarks. — This species was found growing on the bark of Taxodmm distichum, 

 by Prof. H. W. Ilavenel, in South Carolina, and by him given to Dr. Billings, 

 U. S. A., to whom I am indebted for specimens. It forms on the bark minute 

 roundish, blackish, dot-like spots of about a line in diameter, or sometimes, appa- 

 rently, by the coalescence of two or more of these spots, larger irregular patches. 

 The habit of the plant is a rigid one. The main stem is often irregular in size, 

 variously bent and rebent, and mostly gives off a number of branches, which fre- 

 quently nearly equal the main filament in size, and like it are bent in various 

 directions. They also frequently give origin to numerous short branches. In 

 some instances, there is a distinct apical cell, which is cylindrical, but only two or 

 three times longer than broad ; in many cases, however, this cylinder being want- 

 ing, the ordinary cells extend to the extreme apex. 



Fig. 4 rt, pi. 8, represents a filament, and fig. 4 h, the end of a branch magnified 

 460 diameters. 



S. acervatiis, Wood. 



S. in guttulis minutissimis, subernstaceis, nigris, in strato subcontinno sfepe aggregatis; tricho- 

 matibus parvis et brevibus, rigidis, adraodum imequalibus, prostratis, tuberculis, arete et dense 

 ramossissimis, viridibus aut aureis aut brunneis ; ramulis brevibus, plerumque baud ramnlosis, 

 erectis aut ascendentibus, sspe abbreviatis et papilliformibus, obtusis, sa?pe lateraliter connatis ; 

 cellularum scrie in trichomatibus multiplici in ramulis plerumque simplici ; cellulis subglobosis 

 vel subangularibns, viridibus, hand distincte granulosis, in ramulorum apice ssepe breve cylin- 

 dricis et iuterdum obsolete articulatis ; vaginis aureis, nonnihil hyalinis. 



i?mm.— Trich. max. ^ig/ ; ram. teV'-tsV- 



Syn.—S. acervatug, Wood, Prodromus, Proc. Araer. Philos. Soc, 1869, p. 132. 



fla6.— South Carolina, in corttce (Ilex opaca). (Prof. H. W. Ravenel.) 



Arranged in drops, which are very minute, subcrustaceous, black, and frequently aggregate into 

 a subcontinuous stratum ; filaments small and short, prostrate, rigid, somewhat unequal, tuber- 

 culate, densely and closely branched, green or golden or brown ; branches short, for the most 

 part not branched, erect or ascending, frequently abbreviate, and papilliform, obtuse; series of 

 cell multiple in trichoma, mostly simple in the branches; cells subsrlobose or subangular, 

 green, not distinctly granulate, in the apices of the branches frequently shortly cylindrical and 

 sometimes obsoletely articulate; sheaths- golden, somewhat hyaline. 



