Acta Societatis pro Fauna et Flora Fennica, 49, N:o 7. 



33 



the general appearance. — The scrobicules at the thickened 

 and yellowish coloured central area are by high position 

 of the microscope-tubus triangular but by lower position 

 circular (the same structure being present in C. cosmetum 

 West, Desm. U. S. pi. 17 f. 5 and C. tholiforme Cohn, 

 Desm. Bong. pi. 11 f. 9). The chloroplasts are composed 

 of 2 large pyrenoids in each semicell and numerous radiat- 

 ing plates (the details could not be seen). — Compare also 

 C. malinv. var. intermedium Gutw,, Nonn. alg. nov. pi. 7 

 f. 57. 



Hub. Messuby (W). — PI. 6 fig. 38-39. 



C. ceratophorum Liitkem., Desm. Bohm. pi. 2 f. 6—9. 

 Forma granulis marginalibus obtusis, nullis acutis; granulis 

 plus regulariter ordinatis, in centro semicellularum semper 

 2 maioribus. Massa chlorophyllacea axilis in utraque semi- 

 cellula nucleis amylaceis binis uterque laminis 4 radiatim 

 exeuntibus. Long. 31—32, lat. 23—25, crass. 17—19, isthm. 

 6,6—7//. [N:o 1290, 1043]. 



Nearly related species are: C. pilgeri Schmidle, Alg. 

 Volkens. pi. 4 f. 13; C. reinschii Arch. [syn. = C. sp. 

 Re in sen, Contrib. pi. 18 f. 4]; C. limnophilum Schmidle, 

 Beitr. alp. Alg. pi. 15 f. 20. 



Hab. Near Imatra (SE), leg. Hj. Hjelt. Pi. 6 fig. 



31—34. 



C. miraculum, nova sp. Cellulae mediocres medio 

 incisura anguste lineari extremo quidem vix dilatata pro- 

 funde constrictae. Semicellulae a fronte visae subrectan- 

 gulares basi recta, apice fere recto, lateribus convexis ad 

 apicem versus plus convergentibus, angulis superioribus 

 rotundatis. Granula omnia obtusa, in ipsis marginibus la- 

 teralibus 6 (5—7) et intra margines 4 maiora, margo api- 

 calis glaber sed sub apice granula 4 maiora et inferius 

 granula parva 6 in arcum disposita; in centro semicellula- 

 rum granula parva 8 regulariter disposita; circa granulum 

 centrale scrobiculae 4 triangulae; supra isthmum granula 

 singula magna conspiciuntur. A vertice visum extense 

 oblongum, medio non tumidum. Massa chlorophyllacea e 



3 



