Horsetail

Horsetail

Observation - Horsetail - UK and Ireland. Description: Found alongside a path, about 5 minutes walk inland from the coast at Porthgain. Fairly sure it is a horsetail, but could anyone identify it to species level? I have no idea how to start doing that. Thanks very much. Also, if anyone knows what the inci

Found alongside a path, about 5 minutes walk inland from the coast at Porthgain. Fairly sure it is a horsetail, but could anyone identify it to species level? I have no idea how to start doing that. Thanks very much.

Also, if anyone knows what the incidental spider is in the second picture, that would be an interesting bonus!