Etymological Help Needed

In looking through words that were derived from the PIE root bhel-3 in
the American Heritage Dictionary, I noticed that "pall-mall" was
derived (via obsolete French "pallemaille" and Italian "pallamaglio")
from Langobard "palla" 'ball.' However, every other Germanic word that
was derived from PIE *bh- begins with *b.

In addition, I noticed that "psyche" was derived from "psukhein" (<
*bhs-u-kh-),' to breathe,' whereas every other Greek word that was
derived from PIE *bh seems to begin with *ph.

Would someone be kind enought to explain these discrepancies?

Thanks

Bob


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