Sitobolium Desv.

Triana-Moreno, Luz A., Yañez, Agustina, Kuo, Li-Yaung, Rothfels, Carl J., Pena, Nelson Túlio L., Schwartsburd, Pedro B. & Sundue, Michael, 2023, Phylogenetic revision of Dennstaedtioideae (Dennstaedtiaceae: Polypodiales) with description of Mucura, gen. nov., TAXON 72 (1), pp. 20-46 : 37-39

publication ID

https://doi.org/ 10.1002/tax.12858

persistent identifier

https://treatment.plazi.org/id/902087C5-FF99-FFE8-FCD6-FD8CFA1DFF6A

treatment provided by

Felipe

scientific name

Sitobolium Desv.
status

 

III. Sitobolium Desv. View in CoL in Mém. Soc. Linn. Paris 6: 262. 1827 [ Sitolobium J.Sm. in J. Bot. (Hooker) 3: 418. 1841, orth. var., Litolobium Newman in Phytologist 5: 236. 1854, orth. var.] – Type: Sitobolium punctilobulum (Michx.) Desv. (≡ Nephrodium punctilobulum Michx. ).

= Adectum Link, Fil. Spec. : 42. 1841 – Type: Adectum pilosiusculum (Willd.) Link View in CoL (≡ Dicksonia pilosiuscula Willd. ).

= Coptidipteris Nakai & Momose in Cytologia, Vol. Fuji Jub. 1: 365. 1937 [ Coptodipteris , orth. var.] – Type: Coptidipteris wilfordii (T.Moore) Nakai & Momose View in CoL (≡ Microlepia wilfordii T.Moore View in CoL ).

= Fuziifilix Nakai & Momose in Cytologia, Vol. Fuji Jub. 1: 365. 1937 – Type: Fuziifilix pilosella (Hook.) Nakai & Momose (≡ Davallia pilosella Hook. ).

= Emodiopteris Ching & S.K.Wu in Acta Phytotax. Sin. 16(4): 21. 1978 – Type: Emodiopteris appendiculata (Wall. ex Hook.) Ching & S.K.Wu View in CoL (≡ Dicksonia appendiculata Wall. ex Hook. ).

Description. – Plants terrestrial or rupestral; rhizomes short to long creeping, generally branched, with catenate hairs; petioles grooved, adaxially sulcate, bearing epipetiolar buds, unarmed; leaves small to moderately sized, generally less than 1 m long, erect, decompound, 2–4-pinnate, usually with catenate hairs and sometimes glandular hairs, without proliferous leaf buds, axes inalate; veins free, with enlarged apices; sori marginal, provided with abaxial and adaxial indusia fused into a cup-shaped involucre; spores trilete, perispore of prominent ridges and verrucae, or tubercles. ( Fig. 7 View Fig )

Synopsis. – Sitobolium is a small clade of ca. five species sister to Microlepia . Sitobolium are distinguished by their relatively small leaves that have elongate catenate hairs. These hairs often bear a capitate non-glandular terminal cell. Sitobolium punctilobulum and S. appendiculatum additionally have glandular hairs. Sitobolium wilfordii , however, is glabrous. All Sitobolium have epipetiolar buds, enlarged vein endings, and marginal cup-shaped sori comprised of both abaxial and adaxial indusia. The epipetiolar buds distinguish them from their closest relatives, Microlepia and Mucura , but this character is homoplastic and widespread in the family. Sitobolium appendiculatum and S. wilfordii have previously been treated as Emodiopteris and Coptidipteris respectively. The two are united in having tuberculate perispore morphology ( Fig. 4B View Fig ) (vs. the verrucate perispore, with prominent ridges seen in other Sitobolium species), but otherwise lack diagnostic characters to distinguish them as a distinct genus and are therefore included here. The geographical distribution of Sitobolium is the Northern Hemisphere; most species are East Asian— S. punctilobulum is the single North American species. We recovered it as a sister to the East Asian S. zeylanica (as S. scabra ) as did Schwartsburd & al. (2020), who inferred an early Miocene divergence time between the two. This age estimate corresponds well with a major dispersal event from Asia to North America for many plant groups using the Bering land bridge or North Atlantic land bridges ( Lee & al., 2020).

History of use. – Sitobolium was in use by early authors until Moore (1859) subsumed it under his concept of Dennstaedtia ( Tryon & Tryon, 1980) . The original spelling by Desvaux was altered by J. Smith to ‘ Sitolobium ’, but there is no reason to believe that Desvaux’ s spelling was incorrect.

Taxonomic treatments. – The Asian species have been treated (in Dennstaedtia ) by Knapp (2011) and Yan & al. (2013), and by Fraser-Jenkins & al. (2015, 2017), who updated some taxonomy and nomenclature. Sitobolium punctilobulum , the only species in the Western Hemisphere, was monographed by Conard (1908). We include five constituent species of Sitobolium based upon molecular phylogenetic and morphological evidence, and we make necessary combinations for four of them.

New combinations and constituent species

Sitobolium appendiculatum (Wall. ex Hook.) L.A.Triana & Sundue, comb. nov. ≡ Dicksonia appendiculata Wall. ex Hook., Sp. Fil. 1: 79, t. 27C. 1844 ≡ Dennstaedtia appendiculata (Wall. ex Hook.) J.Sm., Hist. Fil. : 265. 1875.

= Dicksonia elwesii Baker in Hooker & Baker, Syn. Fil., ed. 2: 54. 1874 ≡ Dennstaedtia elwesii (Baker) Bedd., Handb. Ferns Brit. India: 26. 1883.

Sitobolium hirsutum (Sw.) L.A.Triana & Sundue, comb. nov.

Kingdom

Plantae

Phylum

Tracheophyta

Class

Polypodiopsida

Order

Polypodiales

Family

Dennstaedtiaceae

Loc

Sitobolium Desv.

Triana-Moreno, Luz A., Yañez, Agustina, Kuo, Li-Yaung, Rothfels, Carl J., Pena, Nelson Túlio L., Schwartsburd, Pedro B. & Sundue, Michael 2023
2023
Loc

Emodiopteris Ching & S.K.Wu

Emodiopteris Ching & S. K. Wu 1978: 21
1978
Loc

Litolobium

Litolobium Newman 1854: 236
1854
Loc

Adectum

Adectum Link 1841: 42
1841
Loc

Sitobolium

Sitobolium Desv. 1827: 262
1827
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