P3R1O1T1H4A1L1L1I1A1
15 points
PROTHALLIA is validvalid
PROTHALLIUM, [n]
PROTHALLIUM, the free-living gametophyte of a fern or other vascular cryptogam, also PROTHALLUS [n]
PROTHALLIUM, [n]
PROTHALLIUM, the free-living gametophyte of a fern or other vascular cryptogam, also PROTHALLUS [n]