122 FUESU-WATEll A L G .E OF THE UNITED STATES. 



T. g:r»cilEc, Bailet. 



T. fcllulis subcylindrieis, utroque fine vix angustatis, graeillimis, diametro 25-30 plo longi-. 

 oribus ; processibus lateralibus brevibus, couiuis. 



Diam.—Cnm process. 7/5 j" = -008" ; sine proc. TSouTr" = -0006". 



;S'ytt — T. gracille, Bailey, Smithsonian Contributions. 



Vucidium prididse, Hobson, Magazine Natural History, v. p. 168. 

 Pleurolsenium gracile, Rabenhorst, Flora Europ. Algar., Sect. III. p. 144. 



JJah. — In iisdcm cum autccedente locis. 



Subcylindrical, scarcely narrowed at the ends, 25-30 times longer than broad ; lateral processes, 

 short, conical. 



Genus SPIROT^NIA, Breb. 



CelluliE rectas, cylindricce vel suljfusiforracs, ssepe in mueo golatinoso aggregate, medio haud con- 

 strictae, utroque polo rotundatiB vel acuminatoe. Cytioplasma chlorophyllaceum in laminis spiralibus 

 dispositum. 



Cells straight, cylindrical or subfusiform, often aggregated in a gelatinous mucus, not constricted 

 in the middle, rounded or acuminate at each end. Chlorophyllous cytioplasm arranged in spiral 

 lamina. 



Sp. bryopliila, (Bkeb.) Rabenhorst. 



Sp. mimina, bryophila; cellulis in gelatiiia niatricali consociatis, oblongo-cylindricis, rectis Tel 

 subcnrvatis, bis vel ter longioribus quam latis, utroque polo rotundatis ; lamina chlorophyl- 

 lacea singula anfractu 1-2|^. 



Z)iom.—^ijV/ = -00033" (0.00024"— .00029". R.) 



Syn. — Spirotsenia hryophila, (Breb.) Rabenhorst, Flora Europ. Algarnm, Sect. III. p. 146. 



Hah. — Propc Philadelphia ; Wood. 



" (S. muscicola (De Bary)) Frond cylindrical two to four times as long as broad, ends rounded; 

 endochrome a single, broad, smoothly defined, widely wound spiral band, its revolutions very 

 few (one or two)." (A.) 



Remarl-s. — I found this beautiful little dcsmicl on the North Pennsylvania Rail- 

 road, near Clielten Hills, growing amongst some mosses which were kept con- 

 stantly wet by overhanging dripping rocks. It formed little transparent masses of 

 almost colorless jelly looking much like drops of dew. It agrees well with the 

 descriptions of the European form, except that there were generally from 2-2^ 

 turns of the spiral, and the cells exceed somewhat the measurements of Prof 

 Rabenhorst. The cells are closely placed in the jelly. 



Fig. 10, pi. 12, represents some plants of this species. 



Sp. condensata, (Breb.) Rabenhorst. 



Sp. cellulis cylindraceis, rectis (vel leviter curvatis) octies vel decies longioribus quam latis, 

 utroque polo rotundatis; laminis chlorophyll, singulis, anfractibus subarctis (plerumque 8-12). 



Dzam.— 0.00075". 



Syn.—Sp. condcnsata, (Breb.) Rabenhorst, Flora Europ. Algarum, Sect. III. p. 146. 



Eab. — Florida ; Rhode Island ; Bailey. Pennsylvania ; Wood. 



Frond cylindrical, two to four times as long as broad, ends rounded ; endochrome a single, 

 broad, closely wound .^spiral band, its revolutions numerous. L. 5J5". Br. txj??"- Archer. 

 Fritchard's Infusoria. 



