zyzzata S.G.Hao (1989)[1] Gumuia is a genus of extinct vascular plants of the Early Devonian (Pragian or Siegenian, around 410 million years ago).

The genus was first described in 1989 based on fossil specimens from the Posongchong Formation, Wenshan district, Yunnan, China.

[1] The sporophyte of G. zyzzata consisted of leafless stems (axes) with an apparently sympodial organization.

[1] A cladogram published in 2004 by Crane et al. places Gumia in a paraphyletic stem group of broadly defined "zosterophylls", basal to the lycopsids (living and extinct clubmosses and relatives).

[2] † Hicklingia Adoketophyton, Discalis, Distichophytum (=Rebuchia), Gumuia, Huia, Zosterophyllum myretonianum, Z. llanoveranum, Z. fertile Zosterophyllum divaricatum, Tarella, Oricilla, Gosslingia, Hsua, Thrinkophyton, Protobarinophyton, Barinophyton obscurum, B. citrulliforme, Sawdonia, Deheubarthia, Konioria, Anisophyton, Serrulacaulis, Crenaticaulis Nothia, Zosterophyllum deciduum extant and extinct members Hao and Xue in 2013 listed the genus as a zosterophyll.