34 



P. Graebner. — Potamogetonaceae. 



4 90 ; W. R. Dudley, The genus Phyllospadix in The Wilder Quarter Century Book. 

 (1893) 403 — 420, 2 Taf; Phyllospadix, its systematic characters and distribution, in 

 Zoe IV. (1894) 381—385; Aschers, in Engl, et Prantl, Pflzfam. II. 1. (1889) 204. 



Spadix late linearis membranaceus in spatham membranaceam foliiferam inclusus, 

 juxta marginem retinaculis magnis ovati-oblongis instructus. Flores dioici. In spicis 

 masculis antherae alternantim distichae, in spicis femineis carpidia cum staminibus sterilibus 

 alternantia. Antherae ex Bentham et Hooker iis Zosterae similes, sed (ex Dudley) 

 crista thecas connectens tantum in rudimentariis conspicua in fertilibus obsoleta et septa 



Fig. 10. Phyllospadix Scoulcri Hook. A Planta sterilis. B Inflorescentia plantae femineae, 



aucta, frb carpidium, r relinacula (in icone nimis patula!) (Fig. A et B ex Ruprecht in Abb. 



Acad. Petersb.). C Fructus a latere, D a dorso visus, a inserlio. E Seinen. F Embryo. 



(Fig. C—F auctae, ex Ascberson in Pflzfam.) 



thecarum loculos separantia persistentia. Retinacula in planta mascula demum reflexa 

 (in feminea semper erectiuscula). Carpidium profunde sagittatiovatum , basi emargi- 

 nationis affixum. Ovulum pendulum orthotropum. Stigmata 2" linearia subsessilia deci- 

 dua. Fructus compressus, coriacei-membranaceus, indehiscens, late ovatus, rostratus basi 

 2 appendicibus acutis. Semen membranaceum. Embryo rhomboideus, subcompressus 

 dorso convexo, venire sulcato, maxima ex parte axis hypocotylei constans. Pars cotyledonis 



