FRES11-W ATKK A L -E OF T 11 E UNITED STATES. 47 



G. mi R ii loin, (KOTH.) J. AOH. 



G. globoso-aiigulona, cava, viridi-fuscescens, ad ccrssi magnitndinem ; trichomatibns strictis, 

 turuln.-is, Huprriic U-viter nYxuosia, pasaim inirrrupii* ; urtu-uli.- inferioribus plus minus 

 comprvsaia, diametro duplo triplove longioribu* ; vaginia amplia, acbrois bic illic leviter con- 

 trictia; spurig plus minus vluiigatis, oblougu-ovatis vet ellipsoiduo-cvlindriciii, diametro 8-6- 

 10 plo longioribus, icrugineo-fuscescentibus, nonnunquaiu leviier curralis, cytioplasiuate sub- 

 tiliter granuloso, turbato. (K.) Specie* HII/U i/jnota. 



Z>iam. CelL pcrd. 0.00036" 0.0005". Spor. max. 0.00059". (R.) 



Syn O. anyulosa, (Uom ),.! ADAKDII., KAHKMIURST, Flora Europ. Algarum, Sect. II. p. 201. 



Hah. Hudson Ilivi-r prope West Point. (Bailey.) 



Globose anpular, hollow, greenish-fuscous, attaining the size of a cherry; filaments strict, torn- 

 lose, above somewhat bYxuose, here and there interrupted ; inferior joints more or less com- 

 pressed, 2-3 times longer than their diameter ; sheath ample, colorless, here and there slightly 

 conxtrirtrd ; spores more or less elongate, oblong-ovate or ellipsoidal-cylindrical, 3-6-10 

 times longer than the diameter, Kruginous-fuscous, sometimes slightly carved, cytioplasm 

 very minutely granulate. 



Gonus KIWI. MM \, ( ROTH.) Ann. 



Thallus et trichomata cadcra qua Qloiotricha, sed vagina; arctissime, swpe in gelatinam roatri- 

 calcm confluentca, qua.si nulle. 



Thallu8 and filaments similar to those of Gloiotricha, hot the sheaths very close, often confluent 

 in the gelatinous matrix and apparently wanting. 



Rcmnrk*. The characters given above are those of Professor Rabenhorst. 

 Flora Europ. Algarum, Sect. II. p. 206 



II. cartilaginea, WOOD. 



R. subglobosa, parva, cartilaginoa, saturate brunnea vcl sabatra, solitaria in plantis aquaticis : 

 trichomatibus maturis-sterilibus, rectis ant subrectis, cylindricis, elongatis, baud articnlatis ; 

 rytioplasmate sa-pe interrupto; vaginis arctis et distiactis; cellulis pcrdurnntilnis globosis, 

 diaroetro snboequalibus : trichomatibus fertilibus rectis aut Hubrcctis, supra spora cellulis 8-9 

 inst metis; gporis elongatis, rectis, cylindricis; vaginis nonnihil craseis, arctis : tricbomatibus 

 immaturis breve articnlatis ; vaginis subamplis. 



Diam. Trich. cum vag. ,,V"; I>or snW'- 



Syn. R carlilayinea, WOOD, Proc. Am. Philos. Soc., 1869, p. 128. 



Hab. ID palade, Northern Michigan. 



Frond sobglobose, small, cartilaginous, deep brown or blackish, solitary upon aqnatic plants ; 

 mature sterile filaments, cylindrical, elongated, not articulated, their cytioplasm frequently 

 interrupted, their sheaths close and distinct, their heterocysts globose and about equal to 

 them in diameter; fertile filaments straight or nearly so, above the spores famished with 8 or 

 9 cells; spores elongate, straight, cylindrical; sheaths rather thick, close; immature filaments 

 shortly articulate, their sheaths rather large. 



Remarks. The frpnd of this species grows attached to the leaves of water-plants, 

 and has its under side markedly flattened so that it is somewhat semi-globose. The 

 filaments which compose the mass of the very firm frond are elongated, cylindrical, 

 and of nearly or entirely uniform diameter throughout. The sheaths are close, 

 distinct, rather thin, open above, and, in many instances, almost or even entirely 

 empty. Scattered atnongst such filaments are the fertile ones. These have at 

 their base an elongated cell, in which is the long cylindrical spore, which varies 



