Tail Speckled brown (mottled) hackle fibers (one shank length)
Body Fawn/tan fox belly fur (dubbed, ribbed)
Rib Brown thread or tan silk (even spiral)
Hackle Ginger and grizzly, mixed (3-4 turns)
How to tie it
Mount hook, start orange thread, and set wood duck wings upright and divided at 70%.
Tie in a speckled brown tail one shank length long, and catch in the rib at the bend.
Dub a fawn-tan body forward to the wings, then counter-wrap the rib in 5-6 even turns for segmentation.
Tie in a ginger and a grizzly hackle together and wind them mixed, 2 turns behind and 2 in front of the wings. The mixed hackle gives the mottled March Brown look.
Whip finish.
Substitutions
Body instead of Tan dubbing with brown markings: March Brown Superfine — Color-matched blend; Fox squirrel dubbing — Natural tan/brown mix
Wing instead of Wood duck flank: Dyed mallard flank (lemon wood duck) — Easier to source; Gadwall flank — Similar barring
Rib instead of Yellow thread: Yellow floss — Wider segmentation; Fine gold wire — Adds durability and flash
Other versions
4 more in the app: Classic Recipe, Fischer's Flies, Gregg Dressing (1940), Beadhead.