16 Hy(lroidf>a. — .Skenotoka. 



m 2. Aglaophenia uncinata Kk( hi-. \FliimuJatia /nicinufa Lam., A. pciuiaria 

 L.MX., Plutiuilaria iiii/riojilii/Uutii Arn. ."^av. i. Pinnae parvae siniplices. in fucis repens; 

 nematothecae et nematocal^^^ces elongatae. 



Hahit. : Mediten-aneum (LAMouKorx). 



tn 3. A. octodonta Krchp. (P/utnidaria octtHlonta [Mexk(;h. in litt.] Hei-lkr). 

 A. phittiae simillima: liydrotliecae nnilto bi-eviores et hitiores, denticuli margini& 

 fere aequales; nematotlieca supia transvei-sim truncata, fere usqne ad hydrothecae 

 <»ris marginem prominens. 



Hahit. : Adria: Firano (P. Tmus). 



m 4. A. elongata Krchp. {PhittmJaria cloiu/ata Mkxeoh.). A. phimac simil- 

 linia: articuli paulh» longiores. hydr(»tliecarum maroo denticulis aeque lonj^is paullo 

 angustiorihus, nematotheca magis patula, Imlrothecae niarginem non attingens. 



Hahit. : -Marc della Toscana" (Richiardi); Adria: Pirano (Hkller). 



5. A. microdonta Piepjjr. Stipites monosiphonii, interdum ramis laterali- 

 hus, altit. — cm, hydrorhiza reptans, solida ; caules ramique articulati, aeque 

 ac pinnulae; hydrothecae in quoque iiinnularum articulo iteruni diviso pr(» hydro- 

 theca et nematotheca, elongatae, fere cylindricae, rectae, maigine vix everso, denti- 

 culis parvis aequalihus, nematotheca mediain hydrothecani non attingens. Caulis 

 ramique fusci, pinnulae alhae. 



Habit. : Adria, litus orientale (Pieper). 



m 6. A. Kirchenpaueri Krchp. (Plmtiularia Kirchnipauci-i Hkm.kr. PJ. aJ- 

 gerieiisis Krchi'. in litt.). Kamuli pinnati longiores, articulis simplicihus. hydro- 

 thecae breves, campanulatae, marginem versus paullo constrictae, margine oriticii 

 4-dentato deiitihus 2 anteriorihus, longioribus, angulo externo dentiformi sinu 

 profundo a denticulis separato; nematotheca a media hydrothecae parte extrorsuni 

 versa, elongata, hydrothecam non superans. 



Hahit. : „Mare della Toscana" (Eichiardi); Adria, communissima: Quar- 

 nero, Pirano, Lesina (Hellkr). 



7. A. arcuata Lmx. Stipites dichutome raniosi aut simpliciter pinnati; 

 hydrothecae calyculatae, margine orali dentato parte interna in processum denti- 

 formem producta ; nematotheca duplo longior quam hydrotheca, angulatim curvata, 

 margine orificii singuli sinuato-(lentat(»; g(in(»thecae nondum oltservatae. 



Distrih. : Africa meridionalis. 



Hahit. : Alger (Krakss). 



tti 8. A. parva Pikpkr. Monosiphonia, simplex, erecta, minuta, e liydrorhiza 

 reptante surculi articulati pinnati : hydrothecae vasculares denticulatae; denticnlo 

 antico panllulo longiore, nematotheca fere us(iue ad marginem hydrothecae porrecta. 



Habit. : Adria (Pieper). 



b) Subgen. Lytocarpia Krchp. Hydr(»rlii/.a glomcrata autrcptans: caulis 

 poly- aut monosipli(»nius ; nematothecae hrcvissimae; hydrotlieca cyathifonnis, ore 

 integro aut subdentato, nematocalices infundilmliformes ; gonangia pluiia in gon^»- 

 cladiis ad basin neinatocladiorum apertis, membrana non conjunctis. 



9. A. myriophyllum T;mx. (ScrfuJarin ttii/riojiJii/Ilum L.. Paij,., Pluttiularia 

 iiii/r. Lam.). Stipitcs fascicuhiti alti, pluniosi, flavidi ; caulis compositus, gihhosus, 

 aut altcrnatim tuiiiidus; pinnae alternantes, confertae approximatae ita ut appareant 

 unilatcrales; hydrotliecae magnae, cylindricae, margine leviter crenulato, anteriore 

 parte denticulo unico mnnita; nematocalices suherecti, neniatotheca processum 

 s}(inosniii curvum tormans, pai-tcm iiifcii(»iuni Iiydiothccac aiiii)lectens; g(»nothecae 

 corbulis apcrtis pr(»tcctae. 



Distrib.: .\fl,inticuiii horcalc. 



I 



