![]() ![]() The “Monachosorideae” has retained ancestral conditions: short-creeping to ascending rhizomes with dictyostele s. Our data enabled us to hypothesize evolutionary patterns of rhizome evolution in extant lineages of the Dennstaedtiaceae. The position of sclerified parenchyma in the cortex and pith varied among species. Lateral-line aerenchyma characterized Blotiella lindeniana, Histiopteris incisa, Hypolepis spp., Paesia spp., and Pteridium arachnoideum subspp. (“Patania”) dissecta, and two subspecies of Pteridium arachnoideum. ![]() A polycyclic solenostele was found in Dennstaedtia (“Patania”) cornuta, D. The exception is Blotiella lindeniana, which has ascending rhizomes with radial phyllotaxy and a dictyostele. Among the studied species, the main rhizome type is long-creeping with alternate phyllotaxy and a solenostele s. We performed morpho-anatomical studies on 26 taxa from eight genera, mostly from Brazil, Japan, and New Zealand. Rhizome morphology in the Dennstaedtiaceae is relatively well known, yet its anatomy has been poorly explored. read more read lessĪbstract: Dennstaedtiaceae is a monophyletic, extant family of ferns with sub-cosmopolitan distribution and ca. While some of these stipes have been described in the past (Gwynne-Vaughan, 1901, 1903, p. The stipe anatomy of the dennstaedtioid (including pteroid) and cyatheoid ferns shows greater structural complexity than that of any other extant group of ferns. 71-72) placed them in three subfamilies of the Cyatheaceae. Holttum and Sen (1961) did not attempt to answer whether the above genera should be considered as belonging to subfamilies of a single family or remain as separate families, but Holttum (1963, pp. This removed the main objection to uniting the tree ferns into one family, but Dennstaedtia was regarded as belonging to a different group of genera, even though there is evidence of some relationship with the tree ferns. Later Holttum and Sen (1961) demonstrated a close relationship between Cyathea, Dicksonia, Culcita and Cibotium on the basis of the development of the sorus. Holttum's Dennstaedtioideae was considered the most primitive of 11 subfamilies. ![]() He placed the Dennstaedtiaceae in a central position as a large, complex family including 81 genera. Separation of the tree ferns into Cyatheaceae and Dicksoniaceae was maintained by Holttum (1949). Conard (1908) believed that Dennstaedtia belonged in the Polypodiaceae, as it was separable from the Cyatheaceae on characters of the annulus, antheridium, and prothallium. 5) system they were includedin the Dicksoniaceae in a scheme which separated that family from the Cyatheaceae. Abstract: The scope and position of the dennstaedtioid ferns in the Filicales has varied considerably in systematic treatments. ![]()
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