110 ARKIV FÖR BOTANIK. BAND 1. 



cess. 39 f.1, cum process. 78 |it; lat. sine process. 28,5 jU, cum 

 process. 74 /.i] lat. isthm. 19,. 5 f^i; long, process, circ. 26 f.i. 

 Bio Grande do Sul. Cachoeira (15). 



Euastrum Ehrenb.; Ralfs. 



E. latipcs NoRDST. 



Long. cell. 113 ^/, lat. 65 », erass. 39 (.i\ lat. lob. pol. 

 30 i^i\ lat. isthm. 15, .5 ^i. 



Måtto Grosso. Bandeira (36). 



E. Didelta (Meneuh.) Ralfs. 



Faraj/uai/. Areguä (51). 



E. quadriceps Nordst. 



Long. cell. 115 — 116 //, lat. 63,5 //, cra.ss. 41,5 ,i/; lat. 

 lob. pol. 23,5 ^/; lat. isthm. 20,5 ft. Tab. 4, fig. 21. 



Paraguay. Areguä (50). 



E. ansatum Ralfs. 



Bio Grande do Sul. Porto Alegre (3, 5). Matto Grosso. 

 Cuyabå (32). Paraguay. Areguå (49). 



Forma apicibus leviter dilatatis; semicellulee e 



vertice visai lateribus 4-undulatis. Long. cell. 78 /.i^ lat. 

 40-44 ^/; lat. isthm, 13 //. Tab. 4, fig. 22. 



— — Forma major, membrana in medio semicellulee scro- 

 bicula instructa. Long. cell. 107 f.i, lat. 48 /<; lat. isthm. 

 13 ^/. 



Bio Grande do Sul. Cachoeira (14). 



E. abruptum Nordst. 



Long. cell. 45,5 — 52 //, lat. 32,5 — 35 ^k; lat. isthm. 

 8-9 fi. 



Bio Grande do Sul. (25). Paraguay. Areguå (49, 50, 51). 



Forma membrana supra tumorem centralem .scro- 



biculis 2 ornata. Long, semicell. 28 — 29 //, lat. 40,5 (.i, crass. 

 26 ^r, lat. isthm. 9 ^/. Tab. 4, fig. 23. 



3Iatto Grosso. Corumbå (43). 



— — Forma minor incisura lobi polaris profunda et 

 aperta, intra marginem apicalem utrobique verruca emargi- 

 nata ornata (aculeis nullis); lobulis lateralibus inferioribus 

 aculeis singulis instructis; semicellulee a latere visas apice 



