Curtis Clark describes this old Irish alphabet and the plants that correspond to it. He considers its origins in the light of the distribution of those plants, with maps.

Rob Gombach of Utah State University discusses the various theories of the origins of this Irish writing system, and their drawbacks. He argues for the alphabet having been influenced by Greek writing.

Jost Gippert of Frankfurt University aims to provide a new edition of the corpus of ogham inscriptions. Photographs with translations of ogham stones from Ireland, Wales and Scotland. Bibliography.

The Equinox Project reproduces this article by Barry Fell from the Epigraphical Society Occasional Papers vol.22, which includes the ogam alphabets listed in the Book of Ballymote.

Liberty Mill's illustrated guide to this ancient Irish writing system, with a complete table of Ogham characters. Examples of standing stones with Ogham inscriptions. Links.

An essay by Kevin Jones arguing for a derivation from the Greek alphabet.