61. 
62. 
7 
tenuissimis, brunneis striata; ligula oblongo-triangulari, sporan- 
gio dimidio breviore; phyllopodiis nullis; rhizomate trisulcato, 
citius desquamato; radicibus glabrescentibus, — Species haec 
Isoeti setaceae peraffinis, sed ab ea differt: area magis ex- 
pansa; prominentia parva (in I. selacea inconspicna), dorso 
vaginae aream superante; area striis minutis, brunneis, inpri- 
mis in parte inferiore superioreque adspersa (in aliis speciebus 
striae deficientes); ligula sporangio diwidio breviore (in 1. se- 
tacea ligula sporangium longitudine subaequante); alis membra- 
naceis a margine vaginae in partem inferiorem folii confinuanti- 
bus, et longitudine vaginam subduplo superantibus (in I. sefacea 
illis vaginam quadruplo superantibus); macrosporis costis fri- 
bus valde prominentibus instructis, tubercula maxima minus 
numerosa, 25-36 in medio basilari et 4—7 in utroque latere 
triangulari gerentibas (in J. setaces tuberculis in lateribus fri- 
angularibus deficientibus, et in latere basilari subobsoletis). 
Microsporae in utraque specie aequales sunt. (Auszug aus d, 
Monogr. Al. Braun’s.) 
In Teichen und Morästen, die während des Winters unter 
Wasser stehen, im Sommer aber trocken liegen, Saint-Raphael 
auf Corsica (Perreymond). 
], setacea Delille. Macrosporis in latere basilari subtiliter 
tubereulosis, in lateribus triangularibus laevibus; microsporis 
costis denticulatis instructis; foliis basi in bulbum conniventibus, 
8-16 longis, pallide viridibus subflavescentibus, textura laxa, 
lacunis amplis, subdiaphanis, stomatibus et fasciculis fbrosis 
instructis, lineari-setaceis, flexibilibus, erectis, basin versus in 
‚vaginam dilatatis; velo perangusto arcuato non nisi minimam, 
partem sporangii obtegente; area viz conspieua; ligula ovali- 
acuminata, sporangium longitudine subaequante; phyllopodiis 
nullis; rhizomate bisulcato; radicibus glabrescentibus. 
Gegenden des mittelländischen Meeres, See Grammont bei 
Montpellier, Lachen des Plateaus von Roque-Haute bei Agde 
(Fabre); Porto-Vechio (Gay). 
Sect. III, Species terrestres Al. Braun. — Rbizoma pbylie- 
podiis persistentibus vestito; foliis lacunis angastis, 
stomatibus et fasciculis fibrosis instructis; vele 
completo. _ ’ 
I. Hystriv Durieu. Macrosporis aubtilissime reticulatis; mi- 
‚eFosporis trancato-aculeatis; foliis basi in bulbum conniveutibus, 
superne expansis, tarius erectis, 1—13' longis, Kliformibus, 
