P3R1O1T1H4A1L1L1I1
14 points
PROTHALLI is validvalid
PROTHALLUS, [n]
PROTHALLUS, the free-living gametophyte of a fern or other vascular cryptogam, also PROTHALLIUM [n]
PROTHALLUS, [n]
PROTHALLUS, the free-living gametophyte of a fern or other vascular cryptogam, also PROTHALLIUM [n]