FK KSII-U ATI: u Ai.ii.i: <>i TIM. t N i T KD STATES. 65 



Syn.S. /fairnr/ii.Woop. Trodromu-, l'r..i- Am. I'liilog. Sot, 1869, p. 130. 

 I lab. In cortice, South Curolina. 



> I Tilling little turfy spoU of a grrciiUh color, on bark; filaments mostly creeping, either 

 brownish-olive <>r ycllowi>li-oroii, moderately branched; branches ascending, rigid, flexu- 

 vi-ry rurrly with secondary bruiichlcts, cither browuitth-olive or yellowish- 



bruwn, rarely .-iil>traii>|iareut ut tin' upex ; rytin|ilu>m eolorlemi, granular, often extending out 

 I'iNond the r.|ii-utli. i:'-jieral!y articulate; joints longer or shorter than broad; sheath* clone. 

 thii-k. l.rowni.-h-olive . ij-brown, lor the most part truncate at their ends and open, 



their surface sometimes irregular; helerocygUt subquadrate, single, interstitial. 



nark*. I am indebted to Prof. H. ^ ncl for specimens of this very 



distinct species. Sonic of these are labelled as having grown on the twigs of a 

 (his in South Carolina, other specimens are on the bark of a willow. The branches, 

 which are mostly .shortish, .simple, and variously curved, are sent up in great 

 numbers by the creeping stems, and, like the stems themselves, are mostly I 

 but not unirequeiitly are closely adherent by their edges. 



The internal trichoma or cytioplasm, owing to the great thickness of the sheaths, 

 : M r\ apparent within these latter, but not unfrequently projects for a dis- 

 tance beyond them, when it is seen to be colorless, very granular, and mostly, but 

 not always, distinctly articulated. In the young plant the filaments are bright- 

 <;rceii, often not more than 5? Vff ^ an * nc ^ i thickness, and have the sheath very 

 thin, or may be almost imperceptible. It affords me great pleasure to dedicate 

 this species to Professor llavenel, not as an acknowledgment merely of his aid in 

 my studies of this hitherto neglected branch of the North American Flora, but 

 rathe* of the great services he has rendered science in some of its kindred 

 branch' 



1 MI;. 1, pi. 5, represents the end of a filament of this species magnified some 450 

 diameters. 



Genus TOLYPOTHRIX, KTZ. 



Trichoma scytonemacca cum ccllulis pcrdurantibus ecriatis. 



Filament similar to that of scytoncma, but with the hetcrocysts seriate. 



T. di*lorla, (MULLER) Kurz. 



T. CRSpitoso-floccosa, Isete et pnlchre viridis ; trichomatibus intcrtpxtis, leete viridibus, modo 

 distincte articulatis modo inarticulatis ; articulis diametro brcvioribus stcpa aut sub-nullig 

 aut nullis ; psendoramulis singnlis; vaginis arctis, homogeneis, vitreis; cellulis )>crdurantibuB 

 basilaribus et interdnm interjectis, pachydermaticis, plerumque in parallclogramma! cnormis 

 forma, plerumque 4-seriatis, subachrois, interdum sparsissimc granulatis. 



Diam ' v " 3 J vv ". 



8yn. T. distorta, (MuLLER) KTZ. RABKNHORST, Flora Europ., Algarnm, Sect II. p. 275. 



Hob. In aqnario, Philadelphia, Wood. Rhode Island (Olney) Thwaitea. Warden's Pond, 

 Rhode Island ; Resenroir Pond, West Point ; Fourth Lake, Madison, Wisconsin, Bailey. 



Floccnlent cespitose, bright, beautiful green ; filaments intcrwoTcn, bright green, partly dis- 

 tinctly articulate, partly continuous ; articles shorter than long, often very indistinct, some- 

 times absent; branches single; sheaths close, homogeneous, glassy; hetcrocysts basilar, 

 9 M*y. 1878. 



