- 94 - (2) 



from Schrader himself who naines it P. compressas (i. e. P. Friesii). 

 If ne were the author of mucronatus as applied to Friesii, would 

 lie not naturally hâve used his own name ? 



2. Potamogeton lucens L. subsp. vaginans Bojer 

 (sp.) MS. 



Stems long, semiterete, slender below, lower internodes long, 

 upper 6-12 lin. long., strongly striated when dry. 



Leaves ail submerged. sessile or seiniainplexicaul, undulate, 

 entire on the raargin. Upper lanceolate, lower oblong-lanceolate 

 9-veined. tbe central nerve thick, those near the rnargin faint. 

 cross-nervation faint, a régulai* network of interspaces 1 (on an 

 average about 280 to the leaf), without cancellate areolation, 

 2-4 Va inches long X 7 2 "- 3 A" wide; on either side of the central 

 nerve there is a network of irregularily disposée! faint nervation, 

 especially towards the apex of the leaf, less so towards the 

 rniddle, and dying ont towards the base of the leaf. Stipules as 

 long as, or longer than the upper internodes, very thin and 

 translucent. soon decaying, acute. 



Peduncule 2 inches stout, slightly enlargïng upwards. Spike 

 1 inch, flowers nunierous, not interrupted. Sepals (perianth- 

 seginents) oblong-orbicular. 



Habitat. Madagascar : Environs de Tananarivo. July, 8, 1810. 

 M. Goudot. Envoi reçu en 1840. 



« Les eaux d'itas, où le chaton de fleurs de cette plante vient 

 nager à la surface; la tige est très longue. » 



In habit allied to P. prtelongus Wulf. and P. decipiens Nolte, 

 differs from the former by the non-cuculate leaf apex, and the ner- 

 vation is litcens-type. not prœlongns. From the latter by the stem, 

 stipules, and leaf-bases. The mid-vein is excurrent at the leaf-apex. 



Bojer so far as I hâve been able to ascertain never published 

 this name which he uses on his label of a spécimen for Mauritius 

 n° 2120, of course as a species; it seems better to take up his 

 name than to make a new one. I place it provisionally under 

 P. lucens L. but although nunierous spécimens hâve been seen. 

 none hâve any semblance of floating leaves. If thèse are présent at 

 any time it cannot be put under P. lucens; which placed under the 



1 In P. lucens lliese average aboul 700 to the leaf. 



