sis 
59. 
in vaginam dilatatis; vagina dorso laevi; velo partem superio- 
rem sporangii tantum obtegente; area latitud.ne marginis mem- 
branacei; lignla ovali, parva; phyllopodiis nullis ; rhizomate 
depresso, carnoso, aelate profectiore vertiealiter bisulcato, deni- 
que bilobo ; radieibus subglabris. — Planta robusta, omnino 
submersa. 
Auf dem Grunde der Seen: in den Vogesen und der Auvergne, 
im See Saint-Andeol sur l’Aubrac; im See Guery in den Monts 
Dores; in den Seen der Pyrenäen; im See zu Aude, zwei Mei- 
len von Mont-Louis, “ 
Seet. II. Species palustres Al, Br. Phyllopodiis nullis; fo- 
liis lacunis amplis, stomatibus et faseiculis fibrosis 
instruetis; velo incompleto. 
1 tenuissima Boreau (Notes sur l’Agave americana suivie de la 
description de quelques plantes nouvelles ou peu counues, An- 
gers 1850, p. 21), Macrosperis obtusangulis subrotundis, tuber- 
eulis paucis munitis, io medio basilari 8-15, in lateribus tri- 
angularibus plerumque tubereulo unico, rarius medium versus 
2-3 praeditis; microsporis hispide-muricatis; foliis 4— 6 lon- 
gis,, textura laxa, lacunis amplis, diaphanis, fasciculis fibrosis 
peripherieis destitutis, stomatibus praeditis filiformibus, angu- 
loso-triquetris, flexibilibus, basin versus in vaginam dilatatis; 
velo partem magnam sporangii obtegente; area angusta, mani- 
festa; ligula radimentari; rhizemate graeili, subtrisulcato ; radi- 
eibus glabrescentibus. — Planta gracillima pariter ac I. lacu- 
stris, submersa, ]. adspersae peraffinis, a qua differt defectu 
fasciculorum fibrosorum stationeque (Al. Braun), 
Im Teich von Ris-Chauyron im Canton Dorat, gemein um 
Azat in der Haute-Vienne (Gay). 
1. adspersa Al. Braun. Expl. sc. Alg. (ined.), t. 37. Sg. 3. — 
I. setacea . Perreymondi Bory. Compt. rend. inst. 24. Juin 
1844. — I. lineolata Dur. Hb.? I. capillaces Bory. Mem. de 
PAcad. d. sc. de Paris. Seance du 28 Sept. 1846. — Flora 
od. allgem. boten. Zig. 1846. p. 719) Macrosporis acutango- 
lis, tuberculis maximis, remotis (in medio basilari 2536 et 
in quovis latere triangulari 4—7) instructis; microsporis costis 
dentieulatis praeditis; foliis 4—6'/, longis, basi approsimatis, 
in bulbam conniventibus, erectis, stomatibus fascisulisque fibre- 
sis peripherieis praeditis, filiformi-setaceis subulatisque, basin 
versus in vaginam dilatatis; velo perangusto arcuato,; sporaD- 
gium non obtegente; arena ‚subexpansa, dorso lineis minutis, 
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