The narrow brown sheaths from the base of white pine leaves now strew the ground

September 5. 

Saturday.

I now see those brown shaving like stipules of the white pine leaves, which are falling, i.e. the stipules, and caught in cobwebs.

River falls suddenly, having been high all summer.

H. D. Thoreau, Journal, September 5, 1857

I now see those brown shaving like stipules of the white pine leaves, which are falling. See September 1, 1860 ("Many pine stipules fallen yesterday. Also see them on Walden to-day. "); September 3, 1858 ("The narrow brown sheaths from the base of white pine leaves now strew the ground and are washed up on the edge of puddles after the rain.")