FK i:> ii \\ATI-: u \i .;.!: OF TIM: I-.NITKD STATES. 53 



well shown in figure '.'/. pi. .~>. Associated with them \\< iv a number of similar n IN 

 which hail not obtained a> \et the outer thick wall. The color of the h' laments is 

 in my *\>< < -miens of a rich golden l)rnwn ; hut, as they have been ppM mtl in car- 

 holic at id water, I cannot .speak po>iti\ely a.s to the original tint. The hcteroe\-ts 

 aie Mih^'luhose, sometimes compressed, sometimes somewhat triangular. They 

 about equal in diameter the internal tilainent. 



J. pi. ~>, represents a small cluster of youngish filaments of this species. 



Jl. -< jllllCllllll. \\ .(.-p. HOT.) 



M. ihulln cu-.-pitulo, molle, panwitico ; triclmimitibii<i Minplicilm*. pl.Tiimquc inarticnlatis, ged, 

 intcnliim l>reve, inicnluiii lunge, artieiiluti.-., continiiis, ruriiis iiitiTni|itis, apice iillennatix, 

 flavo-iiliwtrcis uut viriililius, sparse granululis ; vaginis |)lcriiiii<|ui! amplJH et dmtinctis, hya- 

 linis. Mi-pius ralde uniliilulis, apiee plt>rumi|ue vulde amplificutis ft in Gbrillas polutis; cellulis 

 pcnlurantibus diamutro 8ubtc((Ualibim ; Fporis imllis. 



/>ini._Trii-hom je'uo" .00016"; cum Tag. ,,'" .0005". 





 In phiiitaruni aquaticarum folii^, Carp Km r, Michigan. 



Timlin.-* scunrwhat cwspitose, soft, parasitic; filaments simple, mostly inartirnlatc, but some- 

 times shortly soinrtimi's long urtii-iilatc, continuous or more rarely interrupted, attenuate at 

 the npex. yellowish-olire or greenish, sparsely granulate; sheaths mostly ample and distinct 

 Imilim-, often strongly utululatc, the apex mostly much amplified and dissolved into fibrilke; 

 lirUTrysU about equal to the filament in diameter; spores wanting. 



It> murk*. This species was found in tho Carp River bog, growing on the edges 

 of minute leaves, so as to form little prominences or thickenings of the margin. 

 The trichomata are quite distinct from one another, and can scarcely be said to be 

 united into a frond, although they all appear to radiate from the base, where they 

 are consolidated into a dense mass. The sheaths are generally quite distinct, much 

 broader than the cytioplasm, and are not sensibly dilated below. In most speci- 

 mens they are \ery distinctly alternately dilated and contracted, or in other words, 

 niulnlate-d. This is especially the case when the sheaths are quite wide. Above, 

 they are rapidly and widely dilated, arc distinctly fibrillose, and appear to gradu- 

 ally molt away. The cytioplasm is rarely articulated, and, when it is so, the joints 

 are scarcely longer than broad, and are most generally confined to the distal end of 

 the filament. The. species appears to be most nearly allied to M. lianertanum, 

 (iiirx.. from which, however, it is quite distinct. 



1 iir. '2 a, pi. 4, represents this species magnified 250 diameters; fig. 2 i, a single 

 filament magnified 800 diameters. 



.H. clongatum, WOOD. 



M. initio subglohosum, postea ssepe nonnihil fusinnm, nigro-viride, lubrirum, firme ; triehoma- 

 tibus erugineis, valde elongatis, flagelliformihns, intcrdnm inarticulatift sod Riepius breve 

 articnlatis, interdum ad genicula valde constrirtis, apirc interdnm truncatis sod plerumque 

 in pilum, longum, achroam, flexnosum, prodnctis; vaginis achrois, arctis, ssepe apicc truu- 

 catin; cellulis perdurantibus globosis Tel subglobosis. 



Diam T/ OB " = .00026." 



Syn. M. rlongatum, WOOD, Prodromns, Proc. Araer. Philos. Soc., 18C9, p. 128. 



Bab. In aqnario. 



