part_of part of part of collective plant organ structure gametophyte coma plant_anatomy PO_GIT:682 A collective plant organ structure (PO:0025007) which is a cluster of gametophore branches (PO:0030021) or non-vascular leaves (PO:0025075) at the top of the gametophore axis (PO:0030020), forming a tuft. comae (broad, plural) In the moss genus Sphagnum, the gametophore coma is always composed of gametophore branches, but in all other mosses, it is composed of non-vascular leaves. ISBN:9780958222471 PO:0028005 gametophore