187 



Long. l /m — 1/91'" — 0,00073—0.00097", lat. */i75 — Vu»"' = 

 0,00051 — 0,00074". 



Hab. in locis paludosis, stagnis totius Europae. 



Spec. admoduni variabilis, adEuastro cleganti specic vix discerni potest. 



E. cuneatum Jenner (in Ralfa Brit. Desmid. p. 90. N. 17. T. XXXII. 

 F. 3. Archer in Pritch. Inf. p. 731. Rabenh. Krypt. Flor. v. Sachs. 

 p. 187.). £. magnum, diametro duplo subtriplove longius, late lanceo- 

 latum , utroque polo truncatum ; semicellulis perfecte cuneatis, non 

 lobatis, integerrimis, in apice late truncatis, profunde bifidis ; cytioder- 

 mate lacvi vel subtiliter punctato, intumescentiis numerosis pracdito. v. v. 



Long. l / 2 2 — 7i9'" = 0,0041—0,0047", lat. i/ 38 — i/ 36 '" = 

 0,0023 — 0,0024". 



a. Forma major, semicellularum angulis basalibus rotundatis. 



b. Forma minor semicell. angulis oblique truncatis , unde sinus 

 valde ampliatus cst. 



Hab. in Britannia magna, Hibernia, Germania hucusque singulatim ; 

 b. in Saxonia ad Wurzen (Bulnheim), prope Dretschen (M. Rostock). 



LXYII. Iflicraslerias Ag. (1327); Cellulae subplane 

 compressae , profunde constrictae , ambitu orbiculares vel late illipticae, 

 a vertice fusiformes utroque polo acutae, apice aut integrae aut bifidae. 

 Semicellulae profunde tri- vel quinque-lobae , lobi basales aut integri 

 aut pluripliciter inciso -lobulati ; lobus polaris aut integer aut sinuato- 

 cmarginatus. Massa chlorophyllacea axilis, in cellulae formam disposita, 

 granula amylacea sparsa involvens. Cytioderma plerumque laeve , non- 

 nunquam punctatum, granulatum vel mucronatum. 



Zygosporae globosae , aetate provecta aculeis simplicibus , apice bi- 

 multi-fidis, nonnunquam repetito-multifidis armatae. 



Lobulorum anguli omnes plus minus producti , dentati , cuspidati 

 vel spinulosi. 



Conf. Fig. nostr. 68. 



De Divisionis actu (M. denticulatae) conf. Lobb. in Transact. Micr. 

 Journ. 1861. p. 1. 



a. Semicellulae trilobae. Lobi basules horizontalcs; lobus polaris valde 



dilatatusj dorso plaue convcxus, truiicatiis vel leviter rctusus , a lobis 



basalibus sinu amplissinio discretus. (Tetrachastrum Dixon in Micr. 



Journ. 1859, Archer in Pritch). (Holocystis Hassall.) 



f Loborum anguli integri. 



M. mucronata (Tetrachastrum mucronatum Dixon in Micr. Journ. 



(1859) 1860. p. 7. T. I. F. 5 — 8. Archer in Fritch. Inf. p. 725.). 



