Bourrelly: Loricae & Cysts in Chrysophyceae 



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With the genera Chrysococcus and Pseudokephyrion, we have loricae which are 

 often very much embelhshed and are of a yellow-brown color. These loricae 

 have a very fine pectic membrane entirely impregnated with calcareous sub- 



FiGURE 3. lyoricae of Pseudokephyrion (after Bourrelly). 1-2: conictim; 3; Eulzii; 4, 5, 

 6: Entzii fo. granulata; 7: lieveiiensis; 8: pocuhim; 9: miniitissimiDu; 10: Rutlneri; 11-12: 

 cylindricum; 13: depressum; 14: cinctum; 15: obtusum; 16-19*: latum; 20: Skujae; 21: pilidum; 

 22: Scliilleri; 23: urnula;2i: ehgans; 25: ampullaceum; 26: undulatum; 27: acuiuin; 28: />«/- 

 cherrimum; 29: lintirniahidum; 30: circumcisum; 31: uiidiilatissimum; 32: spirale; 33: pseudo- 

 spirale; 34: gallicum; 35: Klarnelii; 36: form os is si mum; 37: ellipsoideum; 3^: ovum; 39: or- 

 natum; 40-41: circumvallalum. 



stance. Acetic acid dissolves the brown and brittle lorica quite well, and there 

 remains a thin membrane which takes Ruthenium red color admirably. 



Along with the numerous Chrysococci (figure 2) with calcareous theca, two 

 species embellished with spines or needles, have a sihceous wall. We note 

 that the metabolism of the calcareous type and that of the sihceous type may 

 co-exist in the same species. Also, some Pseudokephyrion with a calcareous 

 shell produce siliceous cysts hke the other Chrysophyceae. 



