FRKSII-\VA TKll AL(i.i: Of Till.' IMTED STATES. Ill 



a. Cell* cijtintlrii-itt, irttJi t/ie Jur*um more or less convex, the belly utraightinh, never ventri- 

 cutely injlut, /. 



. Luniiln, (MILLER) EIIRB. 



C. pcrniagimm, sublmve ^strise subtilissimoj vel indistinct*), semilnnare, dorso alto convexum, 

 vi'iitrr Mili|il:iiiuin. u]>icil>us attriuiatis rotundatis ; vcsiculis chlorophyllaceis numcrosis spar- 

 sis; lurrlln ili>iincto sulmpicali corpuscula uumerosa iucludeutc. (II.) 



Diam.jj" ,'" 0.00032" 0.0045". (II.) 



&>//i. C.Lunula, (MiiLi.ER,) EURB. RABENHORST, Flora Europ. Algarum, Sect. III. p. 127. 



llnli. South Carolina, Georgia, Florida. Prof. Bailey. Pennsylvania. Wood. 



V<-ry large, smoothish (stria very fine or indistinct), srmilunar, dorstim strongly convex, belly 

 Mraitrliti>li, the ends attennate and rounded; chlorophyl globules numerous, scattered; vesi- 

 cle distinct, subapicul, including numerous corpuscles. 



C. accroMiiii, (SCURANK) EIIRB. 

 ( I'm: not: maximum. 



C. lineare-fusiforme, sub-rectum ant leve curvatnm, ntroque fine sensim et panllulum atteu- 

 uatuui, diamctro 15-24 plo lougiore; apicibus augustissimc truncatis, achrois; nicmbrana 

 hand striata; vesiculis chlorophyllaccis 11-14 in quoquc crure, in serie axilli siniplici collo- 

 catis; locello apical! parvo, corpuscula numerosa iucludente; zygosporis globosis. 



Diam. Transv. max. T tS " = .0017" ; zygosp. T f J," =.0027". 



Sijn. C. acerosum, (Scu&ANK) EIIUB. RABENUORST, Flora Europ. Algarutn, Sect. III. p. 

 128. 



Hab. Pennsylvania; Wood. South Carolina, Georgia, Florida; Bailey. 



Linear, fusiform, straightish, or slightly curved, at each end sensibly little by little attenuate, 

 15-24 times longer than broad ; apices narrowly truncate, transparent; membrane not striate; 

 chlorophyl globules 11-14 in each limb placed in a simple axillary series ; apical vesicle 

 small, containing numerous corpuscles ; zygospores globose. 



/,' nun-la. The dcsmid, described above, was found in New Jersey, near Cam- 

 elm. It differs from the typical form of C. acerosum in its size, proportionate 

 length to breadth, and in not being striate. The European "formd major" 

 (ItAiiENH.) appears, however, to exceed it in transverse diameter, and, according 

 .'ine authors, certain fronds of the species are not striate, and all authorities 

 jijjrcc that at times the striae are exceedingly delicate. For these reasons, I think, 

 our American form must be regarded simply as a variety. As far as can be judged 

 from the rude figure, it is this species which Prof. Bailey identifies as C. tetiue, 

 KTZ., in Silliman's Journal for 1841. 



Fi<j. 5, and 5 a, pi. 11, represent this species magnified 250 diameters; 56 

 represents the sporangium with portions of the dead fertile fronds still attached. 



C. areolatiun, WOOD, (sp. nov.) 



C. fusiforme, subrectum vel noifnihil cnrvatnm, lateris ventralis medio saepe paullulum concavnm, 

 diametro 9-10 plo longius, utrinque modice attcnuatum; apicibns truncato-rotnndatis; mem- 

 brana crassa, et firma, rubido-brunnea, profunde distantc striata, et minutissime Bed distincte 

 grannlata vel areolata; suturis medianis distinctissimis 4-10. 



Diam. 0024". 



Hob. In aquis puris qnietis ; Northumberland Co., Pennsylvania. 



