On Feb 7, 7:17 pm, vincent p. norris wrote:
Brian Clarke and John Goddard, Brits, in their book The Trout and the
Fly, discuss this fly design at length and provide illustrated
step-by-step tying instructions.

FWIW: (for what little it's worth)
The first fly tying article I wrote was a piece about a
bottom-mounted parachute mayfly dun, published in
Dick Surrette's Fly Tyer in 1978.

I tied that fly with an upturned hook--for a while--but by
by the time I wrote about it (substantially pre-dating Goddard
et al) I had already abandoned the upturned hook, because
it all-too-often landed upside down, and the Parachute post
all-too-often acted like a weedless hook guard, that
kept the fly from hooking properly.

It sounds like others have made this (difficult to tie) fly
work for them, but it didn't work for me. The bottom mounted
parachute fly I published in 1978 had a down-pointing hook.