NT0121 20Aug2017 MP
Polypodium vulgare agg. NS6058 26Jun2020 PW
Polypodium vulgare NS6451 18Aug2019
Underneath a pinule the sori are round and dark brown later in the season.
Polypodium vulgare NS6958 21Sep2019 PW
This is appearance of more mature and dried sori under a low-power microscope (approximately x 60). It shows the sporangia have opened up (dehisced) exposing the cells of the annulus. The number of cells is the most reliable way to determine the species.
Polypodium vulgare NS6958 21Sep2019 PW
This is the appearance at x 80.
Polypodium vulgare NS5665 09Sep2020 PW