Single frond. Oxford, late October |
![](../../fernimages/fern_photographs/polypodium/interjectum/interjectum30sm.jpg) | Single frond, underside. late Oxford, October |
![](../../fernimages/fern_photographs/polypodium/interjectum/interjectum31sm.jpg) |
Single frond. Oxford, late October |
![](../../fernimages/fern_photographs/polypodium/interjectum/interjectum32sm.jpg) | Single frond, underside. Oxford, late October |
![](../../fernimages/fern_photographs/polypodium/interjectum/interjectum33sm.jpg) |
Frond. Oxford, late October |
![](../../fernimages/fern_photographs/polypodium/interjectum/interjectum29sm.jpg) | Upper part of frond. Oxfordshire, February |
![](../../fernimages/fern_photographs/polypodium/interjectum/interjectum11sm.jpg) |
Lower part of frond. Oxfordshire, February |
![](../../fernimages/fern_photographs/polypodium/interjectum/interjectum10sm.jpg) |
Lower part of frond. Oxfordshire, February |
![](../../fernimages/fern_photographs/polypodium/interjectum/interjectum07sm.jpg) |
Detail of frond. Cumbria, late July |
![](../../fernimages/fern_photographs/polypodium/interjectum/interjectum27asm.jpg) |
Upper part of frond, underside showing immature sori. Oxfordshire, February |
![](../../fernimages/fern_photographs/polypodium/interjectum/interjectum12sm.jpg) |
Upper part of frond, underside showing immature sori. Oxfordshire, February |
![](../../fernimages/fern_photographs/polypodium/interjectum/interjectum15sm.jpg) |
Upper part of frond, underside showing mature sori, shedding spores. Oxfordshire, February |
![](../../fernimages/fern_photographs/polypodium/interjectum/interjectum14sm.jpg) |
Mid section of frond, underside showing sori after spores shed. Oxfordshire, February |
![](../../fernimages/fern_photographs/polypodium/interjectum/interjectum13sm.jpg) |
Fronds showing mature sori. Cumbria, March |
![](../../fernimages/fern_photographs/polypodium/interjectum/interjectum04sm.jpg) |
Underside of pinnule showing sori, mid development. Oxford, late October |
![](../../fernimages/fern_photographs/polypodium/interjectum/interjectum34sm.jpg) |
Underside of pinnule showing sori, mid development. Oxford, late October |
![](../../fernimages/fern_photographs/polypodium/interjectum/interjectum35sm.jpg) |
Sorus showing sporangia, slightly less developed than above. Oxford, late October |
![](../../fernimages/fern_photographs/polypodium/interjectum/interjectum36sm.jpg) |
Sporangia, mid development. Oxford, late October |
![](../../fernimages/fern_photographs/polypodium/interjectum/interjectum37sm.jpg) |
Developing fronds on exposed site on mortared limestone wall. Oxfordshire, early September |
![](../../fernimages/fern_photographs/polypodium/interjectum/interjectum23sm.jpg) |
Developing fronds on exposed site on mortared limestone wall. Oxfordshire, early September |
![](../../fernimages/fern_photographs/polypodium/interjectum/interjectum22sm.jpg) |
Young fronds on exposed site on mortared limestone wall. Oxfordshire, early September |
![](../../fernimages/fern_photographs/polypodium/interjectum/interjectum25sm.jpg) |
Developing fronds on exposed site on mortared limestone wall. Oxfordshire, early September |
![](../../fernimages/fern_photographs/polypodium/interjectum/interjectum24sm.jpg) |
Young fronds on exposed site on mortared rock wall. Isles of Scilly, late June |
![](../../fernimages/fern_photographs/polypodium/interjectum/interjectum20sm.jpg) |
Plants growing in semi-sheltered site on mortared slate wall. Cumbria, late July |
![](../../fernimages/fern_photographs/polypodium/interjectum/interjectum26sm.jpg) |
Plants growing in semi-sheltered site on mortared slate wall. Asplenium trichomanes ssp. quadrivalens in foreground. Cumbria, late July |
![](../../fernimages/fern_photographs/polypodium/interjectum/interjectum27sm.jpg) | Plants growing in sheltered site in crack in concrete bridge. Oxford, late October |
![](../../fernimages/fern_photographs/polypodium/interjectum/interjectum28sm.jpg) |
On tree-trunk. Cumbria, March |
![](../../fernimages/fern_photographs/polypodium/interjectum/interjectum03sm.jpg) | On tree-trunk. Cumbria, March |
![](../../fernimages/fern_photographs/polypodium/interjectum/interjectum02sm.jpg) |
On fallen tree. Oxfordshire, February |
![](../../fernimages/fern_photographs/polypodium/interjectum/interjectum19sm.jpg) | On fallen tree. Oxfordshire, February |
![](../../fernimages/fern_photographs/polypodium/interjectum/interjectum05sm.jpg) |
On fallen tree. Oxfordshire, February |
![](../../fernimages/fern_photographs/polypodium/interjectum/interjectum16sm.jpg) | On fallen tree. Oxfordshire, February |
![](../../fernimages/fern_photographs/polypodium/interjectum/interjectum08sm.jpg) |