uti i jointi ii-.i 

 •• •:.-•! iption 1 1 • - 



m»ral margin plam D opinion however not ha 



om< ivhat ■ ..i, -in. i. ti, ili. 

 • i... i twittod in . l/'t. /;.///.. tmi 



il I In- ■!••■ - il. I -•■Ii» to in. U -nlli- il i.i 



tl 1 1 

 ! two projM r genera. 



In \|\-Kiii- papcr 011 thi and Desmidiea (Grcvillea N:r 58, 



M \ mm. remark* that ii maj probablj be the mon correct 

 - tu il.- I >• stnidium, the diffi n ni i b< 



onh nen, Aptogonum undulatum Maskrll; ii appears un- 



quite dintind from D. Desmidium, or D. Bailt 

 In - unall förarn i na are Bometiraes -. . n. not in the middlc -.1 



ni, Km i., nr. i- ili. margin (aee ''.m Conjug. tab. ■"•. lii;. •". a). 

 Wolli (Dora. I nit. St. pag. 27) states that ili< Rlaments ..l Desm. BaiUyi 

 ili.- latcral margins are Btraight, not bicrenate, :i characteristic which -■ 

 frora ili> other speciea», bu1 in Ralfs Brit, Desm. tab. •">•'». 6g. I a tli<- Bhort 

 tilun. i iui-ii.l. Ami likewisc in Rab. Mg. exsicc. Vi- 2509, gathered bj Wollb, 



iIh- tilaiii il >i twisted, an. I iln- margins of ii- cellfl bicrenate, l»ni lin- crenaturea 



istant I '',.1 other and extremel} -mall. nearlj imperceptible. ( I cannol 



hclp thinking thal the fainl marginal irregularity does in realitj existo Wallich Deam. 



In the Bengal Bpevimens Mr. Wallich (1. c. pag. 191) han observed that: ili<- margins 



faintiy irregular, a large ..Ui>m. r portion "I iln- free sides ..I eoch joint being Blightl) 



the Burrounding Burface, and tim- detracting somewhal from iln- otherwiae 



Btraight character «.t the margins». (Is not ilii- »raisedi portion very slightlj Binuated?) 



Whol Mr. Wallich 1. >-. -a\- that: t In intermediate space, in 1 »« »t 1 1 the Bengal forms 



• •t ilii- genus, an- Bubject to considerable variation in Bize», i- applicable t<> every variety 



.•t t- - • i is Likewise variabilitj in lengtb and breadth "t the <-'-lls. I. : Br. 



1 : 0,8 1,57. Tli'- joints "I the american forms aeem frequently t.. 1"- aboul eqnal in 



lungth and breadth. 



Tli'- uniting cuahionsi (or proce&ses are perbaps differenl in the varieties of this 

 ,- Mr. Wallich informs us thal they an- »circular» (in the endview); it is so I have 

 them in the Vmerican form (tab. 1. fig. \ b), in iln- New Zealand variety I bave 

 mel merely with cuneiform cushions, 



the drawings bj Wollb I. c. and Bailey in Ralfs Brit. Desm. the 

 elliptic; in the Bengal form, however, they are very nearly circular (Wal- 

 lich 1. • . tab. 1 



\ author has informed us that ilii- species can produce a mucous sheath; both 

 l>n Raciborsk] (Nonn. Desm. Polon. p. 65) literaly say: »trichomatibus non 



- . But whether there i- one or not, i- of n<> consequence. And once in Sweden 

 (in HufVudn&sön near Venersborg) I met with a mucous covering, 63 « in diameter. 



