PUESlI-WATi: K ALG.fc OF T II K f N I I li I) STATK8. 31 



subovalilm*, arete connexU; cytioplasmatc granuluto; cellulis pcrdurantibus iiitcrjectii 



terminal ilm>i|ii<-, ..plKi-rii-i.*. 



Diam. Vrtie. diaui. long. 10 ' oB " .OOOl'J J" ; trangv. n ' 99 " .00017"; cell. p. rdurmnt. 

 M'OO" 



n. 3T. tphtericum (I'uiRET ) V.\i <-ii. KAIIKXIKIUCT, Flora Kurop. Algarum, Sect. II.-p. 167. 



//,i/,. In foiitibus, prope Philadelphia. 



(Jlolxwe, sometimes oblong or oval, gregarious, l.ut rarely confluent, hard, elastic (in advanced 

 ago within sort ami watery?), uln.i. ..... i~. varying fruiu the si/.c of a mustard-need to that uf 



aKinall eherry; prriderm firm, pellucid ; filament* intricate. yellowish, greenish or bluish; 

 articles mostly sul>i|uailrate, sometimes tran-vcr-cly suboval, closely connected ; cytioplasm 

 granular; h I intcr-pcr.-cd ur tiriiiinal, spherical. 



/,' murk*. The specimens from which the above diagnosis was prepared were 

 found at Spring Mills, adhering to mosses and twigs in the water. The fronds 

 were remarkable tor their firmness and elastieity. The color was a dull, rather 

 greenish, olive ; that of the filaments varied from a decided greenish to a marked 

 yellowish, or sometimes an almost silvery hlni>h tint. The heterocysts were rather 

 ;n number, and wen- either terminal or interstitial, sometimes they were with- 

 out, sometimes with evident emlorhromc. The length of the general articulations 

 varied a good deal, it was, however, mostly less than their breadth, which seems 

 quite constant. When kept in water in the house, this species softens, and the 

 periderm as it were peels off, allowing the interior to disj>erse itself as it gradu- 

 ally heroines more and more diffluent. Most of the fronds afforded ample evidence 

 of their method of growth by the presence of filaments in every stage of division. 

 in. pi. >, represents filaments of this species. 



IV. cirruleiim, I.VXOB. 



N. minimum, siepc microscopicnm, cnormiter globosum vcl snbglobosnm, nflixmn, grcgaritim, 

 sejanctum vel aggregatum ; trichomatibuB valde inicqualibus; articulis clongato-cylimlrari-is, 

 vi -I acute ellipticis, vel pcrfectc cllipticia, vel globosis, vel nubglobosia, vcl sulMjuadranguli^, 

 et nonnihil distantibus vcl arctc connectis aat confluentibus ; ccllulis perdurantibus 

 passim interject is terminalibusquc, cctcris duplo vel subduplo majoribus. 



Diam Cell, pcrdurant, .000303; cell, vegetal, plerumquc .00012000166"; rarius .0001 



.00021. 



Syn. ff. cscrulcnm, LTNOB. RABENnoRsr, Flora Europ. Algarum, Sect. II. p. 1C7. 

 Hab. Inter muscos, New Jersey (Prof. Austin). 



Vrry small, often microscopic, irregularly globose or subglobose, affixed, gregarinns, Roparnte or 

 aggregated ; filaments very unequal ; articles elongate-cylindrical, or acutely elliptical or 

 perfectly so, or subglobose, or globose, or Rubqundrnngnlnr, separate and somewhat distant 

 or closely connected or confluent ; hcterocysts globose, interspersed or terminal, double or 

 about double the size of tbo other cells. 



/,' nmrl:*. I am indebted to Mr. Austin for specimens of this species collected by 

 him in Northern New Jersey. The fronds grow attached to moss and are very mi~ 

 nute. the largest I have seen being not more than half a line in diameter. The 

 filaments are remarkable for their inequality, which is often very perceptible in 

 different parts of the same filament. I have referred my IpecifBeiM to ^V. atruleum 



