P3R1O1T1H4A1L1L1U1S1E1S1
17 points
PROTHALLUSES 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]