256 BULLETIN DE L'HERBIER BOISSIER. (8) 



a more extreme from perhaps than the v. tuber culosus Reich. Ic. F. G. 

 et Helv. 7. t. 22, f. 35, and thus towards the fr. of condylocarpus Tausch, 

 but the central outline of the fr. is différant to Tausch's plant!. 



36. P. Spirillus Tuckerman, Am. Jour. Sc. and Arts. 2 d. ser. VI, 

 228 (1848). 



American authors seem lo have overlooked Barton's diversifolius Prod. 

 Fl. Phil. 1815 and Fl. N. Am. t. 84, 37 (1823), of course lüs name cannot 

 be used as Rafînesque's preceded it, but Rafinesque pointed out in the 

 Monlhly Mag. & Grit. Rev. 354 (1817), that his plant was not the same as 

 Barton's, and proposed the name dimorphum for it, and I think it must 

 bear this name. and Tuckerman's become a synonym. 



37. P. hybridus Michx Fl. Am. bor. 1, 101 (1803). As in olher cases 

 D r Morong sinks Michaux's long known name for that of Rafinesque, is 

 P. diversifolius Rafn. Med. Rep. 2 d. Hen. 354 (1808) because hybridus 

 had been used by Thuillier in his Fl. of Paris (1790) (at it was by Pen- 

 lagna Inst. bot. 2, 289 [1787]). 



38. P. javanicus Haskl. Verh. Nat. Nederl. Ind. Soc. Neev. 1, 26 

 (1856). For füll particulars of this species cf. Herr Schinz in J. of 

 Botany 186 (1891) and Bull. Soc. bot. Suisse, Heft 1, 52 (1891). 



39. P. lateralis Morong in Coult. Bot. Gaz. 51 (1880). A little 

 known species, combining the characters to some extent of the hybridus 

 pusillus groups. It should he carefully compared with P. Miduhikimo 

 Makino 111. Fl. Japan, t. 54, p. 2 (1891). 



40. P. Tuckermanii Robbins in Gray's Man. U. S. A., ed. 2, 434 

 (1856). 



P. confervoides Reich. ! Ic. H. G. et. Helv., p. 13 (1845). The peculiar 

 color, and habit of this species so much like a conferva is remarkable, it 

 is a rare endémie N. American plant. 



42. P. pectinatus L. Sp. pl., ed. 1, 127 (1753). 



As with pusillus forms, this species includes many forms variously con- 

 sidered species, sub-species, varieties, or forms. D 1 ' Schumann in the Flora 

 Brasiliensis seems to lean to quile a wide species as pectinatus. Many 

 of the forms require a great deal more study before defmite results can be 

 oblanied. The différence betwen the filiform State of the pl. = pectinatus 

 of the Linnean herb.! and zosteraceus Fr. seems great. 



43. P. latifolius Morong Mon. N. Am. Naid., t. 59, 52 (1893). 

 Described by D' Robbins (Bot. of King's Exp. 40 th Parel. 338, 1871) as 



a var of pectinatus with a query. This is the most extreme form yet put 

 under pectinatus, and is very rare; I know only of 3 stations for it; the 



