A cryptogam (scientific name Cryptogamae) is a plant (in the wide sense of the word) that reproduces by spores, without flowers or seeds. "Cryptogamae" (Greek κρυπτός kryptos, "hidden" + γαμέω, gameein, "to marry") means hidden reproduction, referring to the fact that no seed is produced, thus cryptogams represent the non-seed bearing plants. Other names, such as "thallophytes", "lower plants", and "spore plants" are also occasionally used. As a group, Cryptogamae are the opposite of the Phanerogamae (Greek φανερός, phaneros = "visible") or Spermatophyta (Greek σπέρμα, sperma = "seed" and φυτόν, phyton = "plant"), the seed plants. The best known groups of cryptogams are algae, lichens, mosses and ferns, but it also includes non-photosynthetic organisms traditionally classified as plants, such as fungi, slime molds, and bacteria. The classification is now deprecated in Linnaean taxonomy.
At one time, the cryptogams were formally recognised as a group within the plant kingdom. In his system for classification of all known plants and animals, Carl Linnaeus (1707–1778) divided the plant kingdom into 24 classes, one of which was the "Cryptogamia". This included all plants with concealed reproductive organs. He divided Cryptogamia into four orders: Algae, Musci (bryophytes), Filices (ferns), and Fungi.
Not all cryptogams are treated as part of the plant kingdom; the fungi, in particular, are regarded as a separate kingdom, more closely related to animals than plants, while blue-green algae are now regarded as a phylum of bacteria. Therefore, in contemporary plant systematics, "Cryptogamae" is not a taxonomically coherent group, but is cladistically polyphyletic. However, all organisms known as cryptogams belong to the field traditionally studied by botanists and the names of all cryptogams are regulated by the International Code of Nomenclature for algae, fungi, and plants.
During World War II, the Government Code and Cypher School recruited Geoffrey Tandy, a marine biologist expert in cryptogams, to Station X, Bletchley Park when someone confused these with cryptograms.   
Plant, to see how cryptogams are distributed across modern classification systems
- "Cryptogams". Royal Botanic Garden, Edinburgh. Archived from the original on 2007-11-18. Retrieved 2007-07-02.
- Gilbert M. Smith (1938). Cryptogamic Botany, Vol. 1. McGraw-Hill. Retrieved September 2014.
- P. S. Dixon (1973). Biology of the Rhodophyta. Oliver and Boyd, Edinburgh. ISBN 0-05-002485-X.
- Smithies, Sandy (19 January 1999). "Television Tuesday Watching brief". The Guardian. Retrieved 23 July 2015.
- Davies, Mike. Cracking the code at last of Station X Birmingham Post 20 January 1999
- Hanks, Robert. Television Review The Independent 20 January 1999