Keys to species Jania Lamouroux

1	PLant minute, about 3 mm in diameter	J. pumula
1	Plant larger	2
2	Branches fastigiate, the angles narrow	J. rubens
2	Branches spreading, wide angles	3
3	Segments generally over 100µ diameter	J. adherens
3	Segments generally less than 100µ in diameter	J. capillaceae