FORMS AND DISTRIBUTION OF BATRACHIUM. 101 



2i. ASPERGILLIFOLIUS, 



Batrachiam aspergillifoUum, Dumort. Monogr. Renonc. 14- (18f)3). 

 Originally noticed in Flanders. I have not seen an authentic speci- 

 men. This form, or one closely related to it, occurs in England, and 

 also in the south of France. Resembles circinatus by its distant and 

 rigid leaves with regular outline, but differs from it by its shorter pe- 

 duncles, and by the lateral position of the leaves, not surrounding the 

 stem. It also approaches tricliopJiyllm, between which and circinatus it is 

 intermediate. 



R.paucisiamine/is, Tausch in Flora, vol. xvii. ii. 525 (1834). 

 Batrachium aquutile, var. trichodes, Doll ex Martens et 

 Kemmler, Fl. Wiirt. et Hohenzoll. p. 8 (1865). Batrachium 

 pancistamineum, Schur. Enum. PL Transsilv. p. 13 (1866). 

 Includes Drouetii, confervoides, and at least the smaller- 

 flowered states of tricliopliijllm. Forms 25, 28, 29. 



R. aqiiatilis, (3. p/zellai/dri/oli/ts, Schum. En. PI. Saell. 

 vol. i. p. 171 (1801), includes these forms and probably also 

 submersus. R. slenopetalus, Syme in Rep. Lond. Exch. Club, 

 1869, p. 7, non Hook. Ic. Pl.'t. 677 (1844), was defined as 

 a species to include those in the third edition of ' English 

 Botany,' named trichophyllns, Drouetii, Jieteropliyllus, Syme ; 

 that is, the forms radians, Godrouii, trichophyllus, Drouetii, 

 and submersus of this paper. It is a useful name to apply to 

 certain intermediate states that cannot be further identified 

 with any other published name. 



25. TRICHOPHYLLUS. 



R. tricJiophyllus, Chaix in Villars, Dauph. vol. i. p. 335 (1786). R. 

 divaricatus, 'SicXwavk, Baier. Fl. vol. ii. p. 104 (1789), non Koch, etc. 

 R. aquatilis, e. pantothrix, Koch in Sturm. Deutschl. Fl. hf. 67. f. (1835). 

 Batracliium bipoutinum, F. Schultz iu Gren. et Gotb". Fl. Fr. vol. i. p. 

 24 (1848). Batracliium mliosura, F. Schultz, 1. c. Batrachium- tricho- 

 phyllum. Van den Bosch, Fl. Bat. Prodr. 5 (1850). Fig.— English 

 Botany, Suppl. t. 2968 ; Fl. Dan. t. 2357 ; Cosson and Genu. Atl. t. 2. 

 f. 4. 



Occurs in Norway, Sweden, Scotland, England, Ireland, Belgium, 

 France, Brunswick, Switzerland, Bavaria, Italy, S. E. Australia (state 

 very near this form). Rocky Mountains and Oregon, (Nuttall ! ; state near 

 caspitosus), India (a weak state approaching Drouetii). A state with 

 long peduncles occurs in Sweden ; it approaches marinus, but the carpels 

 are hairy. According to Boreau, R. Bauhini, Tausch in Flora, vol. xvii. 

 ii. p. 525 (1834), belongs to this form. Var. brachypns, Hook, and 

 Arn. Bot. Beech, p. 316 (1841), has the peduncles and internodes shorter 

 than the leaves, which have very slender segments ; it occurs in Califor- 

 nia, Douglas ! A state with rather more rigid and less finely divided 

 and submersed leaves, and with a few subtripartite floating leaves, occurs 

 also in California. 



26. RIGIDUS. 



R. rigidns, Godr. Essai, f. 10 (1839), non Pers., nee Roth. 



Occurs at the Cape of Good Hope (Drege ! 7605), India (Ste^vart ! 

 5000 ft. alt. ; a small form with fewer carpels and longer peduncles, but 

 nearer to this form than to any other). Specimens from the Cape show 

 a complete succession of states from rigidns to Drouetii. 



