The gas spore first appeared in the first edition in the original Monster Manual (1977). The gas spore was further detailed in "The Ecology of the Gas Spore" in Dragon #120 (April 1987).
The blast spore appears in the basic edition of D&D in the Companion Rules set, in the Dungeon Masters Companion: Book Two (1984). In 1991, it appears in the Dungeons & Dragons Rules Cyclopedia.
The gas spore appeared in second edition Advanced Dungeons & Dragons in under the "fungus" entry in Monstrous Compendium Volume Two (1989), and is reprinted in the Monstrous Manual (1993). The gas spore also appears in I, Tyrant (1996).