FRESII-WATER ALG^ OF TUE U J^ 1 T E L) STATES. 1S3 



Syn. — U. merismopedioides, 'Woop, Botanical Report of tLe United States Geological Ex- 

 ploration of the Fortieth Parallel, p. 415. 



Hah. — In torrentibus, Diamond Range (alt. GUOO ft.), Rocky Mountains; (Sercno Watson) Wood. 



Thallus ample, broadly expanded, membranaceous, dilute green, thin, radiately and irreguhirly 

 plicate with its outline often .somewhat rounded; its margin undulate or at times almost 

 crenate; the cells irregularly oval or angular, destitute of nucleus, ciuarternary and obscurely 

 arranged in families after the manner of a merismopedia. 



Remarlis. — Tlie largest fronds of this species that have come under my notice 

 are about three inches long by two broad, thin, easily torn, and not all gelatinous. 

 The portion by which they have been attaclied is very evident, near one of the 

 margins, and from it broad undulations or folds radiate. Sometimes the frond is 

 split up into palmate, lobe-like parts. 



) The cells are not closely approximate, but are placed in a homogeneous translucent 

 membrane, in such a way as to remind one of a Merismopedia. 



I do not feel certain that this plant is distinct from U. orldculata of Rabenhorst, 

 though for the present I have preferred so to consider it. His description is very 

 brief and incomplete, as is also the original one of Thuret, which I have con- 

 sulted. Prof. E,., however, gives U. latissima of authors as a synonym of U. or- 

 hiculata, and certainly this plant is distinct from U. latissima, Harvey, of our 

 'coast. Again it seems impossible that a plant growing near the summit of the 

 llocky Mountains should be identical with one found on the coast of France. 

 Prof Sereno Watson found this plant growing on rocks in a mountaiii stream of 

 the Diamond Range, at an altitude of 6000 feet. 



i Genus ENTEROMORniA, Link. 



Thallus membranaceus, tubulosus vel utriculiformis, basj afBxus (saltem initio, postea sa;po libera 

 natans), e cellularum strato unico compositus, saepe ramosus, baud raro ramosissimus. Fropogatio 

 ■ fit zoogonidiis. Jfoec zoogonidia proceantur in cellulis quibusdam 8-16 cytioplasmatis divisioue 

 'repetita, in polo antico rostriformi ciliis duobus corpus duplo superantibus pra;dita. (R.) 



Thallus membranaceous, tubular or bladder-shaped, affi.^ed by the base (at least in the beginning, 

 •often afterwards floating freely), comi)osed of a single stratum of cells, often branched, not rarely 

 'very much branched. Propagation by means of zoospores, S-lfi of which are formed by the 

 'repeated division of the protoplasm of a cell Their anterior beak-like portion provided with two 

 cilia whose length is not less than twice that of the body. 



E. intfstin.ilis, (Linn.) Link. 



E. teres, forma et magnitudine admodum varia, saepe pedalis etiam supra, leptoderma, saturate 

 vel pallide viridis, 6liformis vel intestiniformis, plana vel bullosa; cellulis 3-5-6 angularibus. 

 i (R-) Species mihi ignota. 



" i)mm.— 0.00048" — 0.0008". (R.) 



Syn. — E.vitestinolis, (Linn.«us) Bailey, Silliman's Journal, N. S., Vol. III., et Rabenuorst, 

 Flora Enrop. Algarum, Sect. III. p. 312. 



Hab — Hudson River, from Newburgh to New York City ; Narragansett Bay, Rhode 



Island ; Bailey. 

 Terete, very various in size and shniie, often n foot or more in length, smooth, deep or ])ale 



green, filiform or intestiiiiform, plain oi' biillose ; cells 3-5-() angular; their diameter 0.00048' 



— 0.0008". 



