"Riella " species primarily grow as submerged aquatic plants, rarely floating or emergent.
2.
Prior to 1900, " Riella " was thought to occur only in regions around the Mediterranean.
3.
Prosecutors haven't decided whether to retry Bergna, 48, in the 1998 death of 49-year-old Rinette Riella-Bergna.
4.
The only other subgenus ( " Riella " subg . " Riella " ) bears smooth involucres that lack these wings of tissue.
5.
The only other subgenus ( " Riella " subg . " Riella " ) bears smooth involucres that lack these wings of tissue.
6.
Bergna, 48, was questioned by police after the 1998 death of 49-year-old Rinette Riella-Bergna, but wasn't charged until last year.
7.
Species of " Riella " are distinguished using morphology of the spores or archegonial involucres, since the gametophytes of the genus possess few distinguishing non-reproductive characters.
8.
The leaf scales are dimorphic and contain scattered oil cells, with a single oil body per cell . " Riella " is thus the only member of its order with oil cells, although other genera in the class Marchantiopsida commonly have them.
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