Crenaticaulis

Crenaticaulis was an early genus of slender, dichotomously branching, leafless land plants, known from the Devonian period and first described in 1969. They were probably allied to the zosterophylls, and are assigned to subdivision Zosterophyllophytina,[2] or class Zosterophyllopsida. They bore branches and scalariform tracheids.

Crenaticaulis
Temporal range: Emsian
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Lycophytes
Plesion: †Zosterophylls
Genus: †Crenaticaulis
Banks & Davis[1]
Species

See text.

A cladogram published in 2004 by Crane et al. places Crenaticaulis in the core of a paraphyletic stem group of broadly defined "zosterophylls", basal to the lycopsids (living and extinct clubmosses and relatives).[3]

lycophytes
 

†Hicklingia

 
 
 

†basal groups (Adoketophyton, Discalis, Distichophytum (=Rebuchia), Gumuia, Huia, Zosterophyllum myretonianum, Z. llanoveranum, Z. fertile)

 
 

†'core' zosterophylls (Zosterophyllum divaricatum, Tarella, Oricilla, Gosslingia, Hsua, Thrinkophyton, Protobarinophyton, Barinophyton obscurum, B. citrulliforme, Sawdonia, Deheubarthia, Konioria, Anisophyton, Serrulacaulis, Crenaticaulis)

 
 
 

†basal groups (Nothia, Zosterophyllum deciduum)

 
 

lycopsids (extant and extinct members)

 
 
 
 

Hao and Xue in 2013 used the absence of terminal sporangia to place the genus in the family Gosslingiaceae in the paraphyletic order Gosslingiales, a group considered to have indeterminate growth, with fertile branches generally showing circinate vernation (initially curled up).[1] Kenrick and Crane in 1997 placed the genus in the family Sawdoniaceae in the order Sawdoniales.[4]

References
  1. Hao, Shougang & Xue, Jinzhuang (2013). The early Devonian Posongchong flora of Yunnan: a contribution to an understanding of the evolution and early diversification of vascular plants. Beijing: Science Press. pp. 52–54. ISBN 978-7-03-036616-0. Retrieved 2019-10-25.
  2. Banks, H.P.; Davis, M.R. (1969). "Crenaticaulis, a New Genus of Devonian Plants Allied to Zosterophyllum, and Its Bearing on the Classification of Early Land Plants". American Journal of Botany. Botanical Society of America. 56 (4): 436–449. doi:10.2307/2440821. JSTOR 2440821.
  3. Crane, P.R.; Herendeen, P.; Friis, E.M. (2004). "Fossils and plant phylogeny". American Journal of Botany. 91 (10): 1683–99. doi:10.3732/ajb.91.10.1683. PMID 21652317. Retrieved 2011-01-27.CS1 maint: ref=harv (link)
  4. Kenrick, Paul & Crane, Peter R. (1997). The Origin and Early Diversification of Land Plants: A Cladistic Study. Washington, D.C.: Smithsonian Institution Press. p. 172. ISBN 978-1-56098-730-7.


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