FUKsii-WA TI: K A i. (..I: 01 TIIK r.\iTi:n STATES. 75 



k*. This sprri. - u u found in winter by 1'rof. II. \\'. Kavcnel in South 

 Carolina, growing upon the lurk of /< i <_ <, forming minute, firm, crustaccous, 

 roundish dot> or m.i^.--., much smaller than a mustard-seed, but in gome cases so 

 cloM'ly ai^regated as almost to make a continuous stratum. "When one of these 

 dots is placed under the microscope, the branches are seen presenting their ends 

 upon all siile>, reminding one of some varieties of coral, and between these are 

 blackish matters, which prevent the whole dot from being seen. These branches 

 are frequently placed very close to one another, and cohere by their < dges so as to 

 make a sort of membrane or a solid mass. The filaments themselves ure mostly 

 obscured in the dense mass of branches which clothe them. This species seems 

 to be closely allied to X. i M /<(//<,/(/,. --, and I am not certain whether it is distinct or 

 not. It is certainly MTV much smaller. 



V |Mlll Ill.tllls. 



S. piilvinatu-. liiiiin-i-;;itiif, saturate olivaceo-nigcr, ad tres lincae crassus; trichomatibng crassis- 

 Kiinis, nimossissiiiiis, fuscescentibns, cuormitrr curratis; rumiilis pulymorphis pro state cras- 

 sitie UgDitndineque variis, apicc plerunH|uc obtuse rotundatis; trichorantum rcllnlarnm eerie 

 imiltipliri. raiiiiiloruiii :! I pliri ; \ iiirinis crassis, lutco-fuscis ad satnrate-fuscix, vel pcllucidi* 

 vrl non pflliicitlis, intcrdura rugoao-tuberculis. 



im. Trich. cum. vag. max. .0042". 



.s',/,1. .S'. I'lilri'nttlii*, (lliifin ) ItAi-.KMionsr, Flora Europ. Algar., Sect. II. p. 290. 

 //, ; /,. in rupibus propc Philadelphia. Wood. 



In innist, dcfp olive-black cushion-like masses of two or three lines thick ; filaments very thick, 

 much liruiicln-d, limwiii.-h, irregularly curved ; branches polymorphous, varying in thickness 

 and M/r, mostly with their apices obtuse; cells of the filament many seriate, of the branches 

 tw<> to four seriate; sheaths thick, yellowish-fuscous to deep fuscous, pellucid or opaque, 

 sometimes rugose-tuberculate. 



-k*. I have received specimens of this species found by Mr. Austin in 

 hern New Jersey, growing on the exposed face of rocks. 



The si/.e attained to exceeds that given by Mr. Rabenhorst for the European 

 form. The color of the cytioplasm varies from an almost verdigris-green to 



fllscOUS. 



l'ie>ides these specimens, Dr. I. Gibbons Hunt has given me fresh ones of a 

 -if/ton which he found growing on the face of dripping rocks along the 

 \\ -ahickon Creek, near this city. These are much smaller in every way than 

 their more northern brethren, and differ in other respects, I think, sufficiently for 

 a distinct variety. The filaments and branches are much flatter than in Mr. 

 Austin's specimens. I append a description. 



( Far. p.i r vii*. 



S. trichomatibus in respite saturate olivaceo-nigro arete intertextis; trichomatibns crassissimis, 

 cnonniter ramosissirais, luteo-fuscescentibns, Tarie cnrvatis; nunulis polymorphis, apice 

 plerumqne obtuse rotnndatis; trichomatnm cellnlarnm serie multiplici, ramnlonim 1-4 plici ; 

 cytioplasmate grannlato, plerumquc saturate fuscesccnte, intcrdura licte viride ; vaginis crassis, 

 dilute luteo fnsccscentibus, interdum achrois. 



Diam. Trichora. cnm. vag. max. S J S " .03" 



