150 
THE NOMENCLATURE OF POTAMOGETONS. 
By Arraur Bennert, F.L.S. 
- (Continued from Journ. Bot. 1890, p. 302.) 
name mucronatus, as applied to the P. pusillus var. major of 
Fries, presents oan mh Gea ae ties. Some authors (Dr. Almquist in 
Hartman’s Scand ed., as a late example) refer to Roemer 
and Schultes eat 8 “(1818) "for the name, but they merely say 
(p. 517), “quid P. mucronatus Schrad.” and in their third Mantissa, 
p- 367 (1827), remark, ‘* P. mucronatus Schrad., ut fertur, cornutus 
est. ert. et Koch in Rohl. Deutsch. Fl. p. 860.” Mertens and 
ieee ag 0 i ie Wi 
takes up the name. Even Koch, in his Syn. Fl. Germ. et Helv. ed. 
2 (1843-45), ee not mention mucronatus, rary he has ee 
natans, 8. proliaxus), ‘* P. serotinus Sch rader in litt. ad a 
Steudel has “ P. lucens mucronatus Whethe er Presl, oben ti 
named a plant from the Philippin islands as “ mucron natus,’” in 
1849, had any knowledge of Keichenbach’s 7th volume of the 
: Icones’ itis wcucioaaet to say; probably he would ignore the name 
as applied to pusillus var. major, using compressus instead. The date 
usually giv yen fae Beichenbah’s 7th volume is 1845, but Ruprecht 
(1845), in his description of Friesii, notes Reichenbach’s using 
mucronatus, so it is evident that the ‘Icones’ must either have 
been published before Ruprecht’s, or that the author had commu- 
nicated 7: eae Me eet If Presl had knowledge of mucronatus 
Schrad., it is s he = not add to his description ‘‘non 
Schrader,” as is s asnilty as 
In none of Schrader’ ni oeks can I find any reference to the 
name. There may be at Gottingen some MSS. of the 2nd vol. of 
the Fl. Oo Seed that Smith (1828) notes he has not received, 
rete would seem that Schrader must have made some prepar- 
ation for it, as Smith quotes ‘‘ P. cuspidatus,” which we find first 
in hayes work. If there exist in Reichenbach’s roar eter speci- 
mucronatus | Peseta ae the 7th vol. of the 
inca vol. ii. (1827 Ae makes no mention of mucronatus Bs bis 
excellent account of ae genus. Further light is wanted on i 
: When specimens of P. Friesii are not in fruit, it is not auiis 
easy to Agate them from P. acemahig 4 Mert. et Koch. In 
nye 
The 
there 
