Repertorium specierum novarum 
regni vegetabilis 
auctore 
F. Fedde 
No. 166/172 VIII. Band I. April 1910. 
XL. 0. Hagström, Potamogetones novi. 
(Bot. Not., 1908, pp. 97—108.) 
1. Potamogeton parmatus Hagström, 1. c., p. 97, fig. 1. 
Caulis pedalis et ultra simplex teres, internodiis 6—10 cm longis; 
folia natantia coriacea obtusa longe petiolata, petiolis foliorum floralium 
13—25 cm longis, laminis mediocris, 45—50 mm longis, 23 mm latis 
basi ovato, vel 60 mm longis basi lanceolato; folia summa ovalia vel 
ovato-ovalia; submersa membranacea cito putrescentia longe petiolata basi 
angustato; vaginae deciduae; pedunculus 5—12 cm longus aequalis; 
Spica florens 23 mm longa; fructus invisus. 
Flora von Zentral-Madagaskar. No. 4031. Statio: Imerino: pr. 
Tananarivo. Leg. J. M. Hildebrandt, 1880. Comm. C. Reusch. 
2. Potamogeton stylatus Hagström, 1. c., p. 98, fig. 2. 
Caulis humilis simplex teres, in axillis foliorum floralium ramis primae 
— 2:e ordinis prolongatus indernodiis 8—5 cm longis; folia rami secundae 
ordinis subcoriacea breviter petiolata lingulata; cetera membranacea, 
Margine levia, sessilia ovalia, basi ovato, obtusa curvata undulata, 
60—70 , , 
~p Mmm; stipulae 10—20 mm longae tenues deciduae; Pedunculi 
aequales 3—4 cm longi; spica florens 15—20 mm. Stylus conspicuus, 
stigma oblongum. | 
Probably it is this species, that has been taken for P. alpinus in 
Boissier, Flora orientalis, V, 1884, 16, but it differs by the short oval 
leaves and 'especially by the stemstructure with its cortical bastbundles 
occurring along the epidermis and sometimes even with some or other 
bundles farther inwards in the cortex. The stele exhibits in a transverse 
Section an oval form with two median channels and 5—6 lateral ones in 
all. Endodermis has typical O-cells. Though well separated from P. alpinus 
it nevertheless apparently takes its place in the neighbourhood of that 
Species particularly for the close conformity of the style and stigma. 
Herbarium of the late East India Company. No. 5605/5. Afgha- 
is t: Herb. Griffith. Distributed at the Royal Gardens, Kew. 1862 
863, 
Repertorium novarum specierum. VIII. 10 
