1869.] l^^ [Wood. 



filaments. Sometimes they are sessile immediately upon the latter, some- 

 times they are raised upon very short branches. They are globose with 

 rather thick walls. No spores were discovered. It seems to me best for 

 the present to class this curious plant with the nostochaceae, although I 

 am not altogether satisfied as to its affinities. 



N. LOBATTJS. Sp. NoV. 



N. thallo vivide viride aut luteo-viride, cavo, enormiter lobato, natante, 

 modice magno, firmo, gelatinoso ; trichomatibus plerumque longis, 

 fiexuosis, dilute viridibus, plerumque articulatis, partim inarticulatis, 

 cylindricis aut sub-moniliformibus, sparse granulatis. 



Diam. trichom ; cell, perdur. 



Bemarlcs. — I found this plant floating upon the Schuylkill river just 

 above Manayunk. The hollow frond was buoyed up by a bubble of gas 

 contained within it. It was an irregular, flattened, somewhat globose 

 mass, of a bright green color and about h an inch in diameter. It seems 

 very probable that in its earlier condition, it was a solid attached frond. 

 The long slender filaments are often very tortuous, but run a pretty 

 direct general course towards the outer surface. 



PAM. RIVULARIEAE. 

 GEN. GLOIOTRICHA. 



G. INCRUSTATA. Sp. Nov. 



G. globosa vel subovalis, firma, solida, ad pisi minimi magnitudinem, 

 dilute viridis, crystallophora ; trichomatibus rectis aut leviter curvatis, in 

 pilum productis, viridibus aut flavescentibus, saepe infra laete viridibus 

 sed supra flavescentibus, baud ordinatim articulatis ; articulis inferiori- 

 bus in trichomatibus maturis brevibus, plerumque compressis ; pilo apicale 

 recto aut leviter curvato, plerumque indistincte articulato, saepe inter- 

 rupto ; vaginis amplis, achrois, saccatis, interdum valde constrictis ; spo- 

 ris cylindricis, saepe curvatis, diametro ad 9 plo longioribus ; cellulis 

 perdurantibus sphaericis. 



Diam. trichom. cum vag. 7Voo"~y5iyo" sporis max. y/^o^'^ToW 5 ^^^l- 

 perd. Y'STSoo • 



Frond globose or suboval, firm, solid about the size of a very small 

 pea, light green, crystal bearing ; filaments straight or slightly curved, 

 produced into long hairs, green or yellowish, sometimes bright green in 

 their proximal portions but yellowish above, not regularly articulate ; 

 lower articles in the mature filament short, and generally compressed ; 

 apical hair — like portion straight or slightly curved, mostly indistinctly 

 articulate, frequently interrupted ; sheath ample, transparent, saccate, 

 sometimes strongly constricted ; spores cylindrical, frequently curved, 

 about 9 times as long as broad. 



Hab. Schuylkill river, plantas aquaticas adhaerens. 



A. P. S VOL. XI. Q 



