FIIESH-V ATI-: K ALG.fi OF Till: PK1TBD > I ATI-: 8. 79 



Remark*. I am indebted to Mr. Austin for sprrini<-ns of this little plant, which 

 he found growing in a swamp near Closer, Northern New Jersey, on a young 

 pin oak. It forms a sort of crustaceous powder, with little aggregations here and 

 there, of a dull reddish-brown color. "When these little masses are broken up, 

 they are found to be composed of little series of very closely joined cells, generally 

 a half dozen to :i do/en in the row. I belie\e that ;it certain states of their growth 

 tin se cells are green, as many of them have a very decided green tint on their 

 iiid 1 have seen one or two of them quite green. 



Fig. ',', pi. 10, represents this species magnified 460 diameters. 



P. piilvrrrii*. W , <.<p. nov.) 



P. cellulia iiiiiiiinis, orruleo-Tiridibos, enormiter pubplobosis, vel aogulosts, in familias nurae- 

 rosas coDBociafls ; fmniliis e o-llulis iininerossissiinis et dense confertis com posit is, irregu- 

 laribus, intrnluin conflucntibua, plcrumquc pseudotcgumculia byalinis involutis, in strato 

 pulvi-iYo hi'U- viridi aggrcgatia. 



Diam. nl<sv"nlm" - .00004" .00013". 



lliil i. In fmitc. " Boiling Springs," prope Bellcfontc, Pennsylvania. 



Cells very small, bluish-green, irregularly snbglobose, oral, or angular, associated in numerous 

 families ; families composed of very numerous and densely crowded cells, irregular, sometimes 

 cuiilliimt, mostly surrounded by a false hyaline tegument, aggregated into a bright green 

 pulverulent stratum. 



/, n<<irk.In. Centre County, Pennsylvania, two miles from Bcllefonte, there is 

 a very lari;e and beautiful limestone spring, which is a favorite roadside watering 

 place, and is laid down on the maps as "Boiling Springs." Forming a stratum 

 DM r mn>t of the bottom of this spring is the little plant here described. The 

 nin is in places nearly an inch in thickness, and when lifted by the hand is 

 fonrtd to t>e dry and crumbly, instead of mucous and tenacious. Under the micro- 

 scope it is seen to be composed of vast numbers of irregular masses or families of 

 imbedded in a firm jelly, which projects so as to form a sort of transparent 

 to the whole mass; this cast I have spoken of in the description as a false 

 inent. The cells themselves are exceedingly small and furnished with an 

 t-ntric point, which is probably a nucleus. 



Genus PALMELLA. 



Cellule globose vel ovalos rel oblongae, tegumentis plus minus crassis in nincnm gclatinosum, 

 MBpios mox conflucntibus involute, thulium diffbrme efficientcs. Cellularum dirisio dircctione in 

 omneg dimensioned alternunte. 



! globose, oval, or oblong, nnrroonded with a more or less thick integument generally very 

 soon confluent into a firm or soft jelly. Thallus shapeless. Division of the culls alternately in all 

 directions. 



P. Jesenii, WOOD. 



P. t hallo indefinite expanse, initio dilute aut laete viride, molle, pellncidnlo; etate prorecta 

 firmo, tnbcrculoso, saturate olivaceo-viride; cellulis globosis vel ellipticis, in thalli state 

 immatnro, plcrnmque singulis ant geminis, siepe distantibus, in state provecta etepc in fami- 

 liaa connexis, plcrumque confertis ; tegumentis in thalli setate immaturo plerumque difflucuti- 

 boi, state provecta plcrumque dUtincli*. 



