Protococonidejp, r^almollaoonf, t(itr;i("Nlroii. COl 



gularibus, angulis obtusis, lateribus concavis, 21:^20, 12 a. crassis. 

 A(l «Cal(las)) nrasilinR (Re(}NELL). 



0. Tetraedron minimum (A. IW.) llansg. in Hedwigia 1888, p. 131, i4i? 

 ot 18Si) p. 18, Pnlyedrium minimum A. Br. Alg. unicell. p. 01, 

 Rabenli. Fl. Fur. Alg. II. p, 02, Reinsch Familiaj Polyedriearum 

 Monograpiiia in Notarisia 1888, n. 11, pag. 409, t. IV, fig. 2 ^*, /", 

 Wollo Freshw. Alg. U. S. p. 185, t. 150, f. 28-31, Pohjcdrium 

 Pinncidium Reinsch Algenfl. Frank. p. 80, t. III, f. 3, ITansg. 

 Prodr. p. 121, n. 173, Polyedrium minuium Grun. in litt. ad 

 Rabenliorst. — Ceilulis e vertice visi.s qua<hMngularibus, angulis 

 rotundatis, iateribus profundius emarginatis 6-10 (raro 12-15) u. 

 iatis, 3-6 a. crassis, e latere visis cllipticis; contentu viridi dein 

 brunneolo; membrana hyaiina. 



ITab. inter algas varias in Rossia (Riacinine) , in Austria 

 (Grunow, Poetscii), Stjria (Pokorny), Germania (A. Rrattn, Ra- 

 RENHORST, Itzigsoiin, Reinscii), P»ohemia (Hansoirg), Suecia (La- 

 oeriieim), Hungaria (Istvanffi), in America boreali (Wolle) ad 

 ins. (( Kerguelen )) Anier. australis (Reinsch), in Afghanistan Asia3 

 (Istvanffi). — T. T. tclragonum etmini^num, species proxima af- 

 finitate, per formas intermediasnon cohasrent. Inter formam majo- 

 rem T. minimi et inter individua minima T. ielragoni nunquam 

 observavit Reinsch specimina intermedia T. minimi forma typica 

 lateribus binis subrectis Reinsch I. c, t. IV, f. 2 /^ et subconvexis 

 Reinsch I. c. t. IV, f. 2 b. Observante claro Reinsch in Notari- 

 sia I. c. adsunt hujus species nonnullfe formfe h. e. — Forma apl- 

 cuiatum Rfiinsch in Notarisia 1. c, t. IV, f. 2 c: lateribus leviter 

 repandis, angulis breviter apiculatis, 8 [>.. diam. — Forma tetralo- 

 bulatum Reinsch in Notarisia 1. c, t. IV, f. 2 d: lateribus omnibns 

 profundius repandis, II ^a. diam. — Var. scrobiculatum Lagerh. 

 in Notarisia 1888, pag. 591, Ilansg. in Iledwigia 1880, pag. 18: 

 membrana cellulre scrobiculato-punctafa. In (( Grunewald » prope 

 Rerolinum Germaniaj (Lagerheim). 



7. Tetraedron quadratum (Reinsch) Ilansg. in Hedwigia I8.S0, p. 18, 1413 

 Polyedrium quadralum Reinsch Familirc Polyedriearum Mono- 

 graphia in Notarisia III, 1888, n. 11, p. 400 1. IV, f. 7, c. — 

 Regulariter quadratum, lateribus subrectis et leviter convexis, an- 

 gulis ohtusis, sjiinula singula imposita armatis; membrana sub- 

 crassa, distincte l)ilamellosa, 31 (i. diam.; crass. membranre 2-45//, 

 Ilab. \\\ stagnis pr. ((Rrlangen)) in Franconia Germania?. — For- 

 ma minus Reinsch 1. c tab. IV, fig. 7, d : acutum, cellula sub- 



