Bommeria is a genus of small pteridaceous rock ferns, native to the New World. Genetic analysis has shown it to be a stem offshoot clade of all the cheilanthoid ferns (in family Pteridaceae),[1] except for Doryopteris, which is an even more basal ("primitive") stem offshoot. for years, it was assumed that this genus was closely allied with Hemionitis, but genetic analysis has shown that genus to be a more advanced genus evolutionarily. The same set of analysis has shown many presumed genera within this family to be paraphyletic, but the small genus Bommeria appears to be monophyletic, or a natural genus.
Bommeria is a "gymnogrammoid" fern, exhibiting unprotected sori aligned along veins on the undersides of the fronds. This is why it was assumed to be closely allied to Hemionitis. Such a feature is strongly at odds with most pteridoid ferns (Pteridaceae), which typically have linear marginal sori with an indusium, and sometimes protected with a reflexed leaf tissue margin. Apparently, this is a trait that can arise independently, and may be an atavistic trait.
The stipes (leaf stems) of Bommeria are hairy, with some scales, and the fronds are hairy, both above and below. The hairs above and short and sharp, while the hairs below may be straight or curled. Scales are also present on the bottoms of the fronds.
The genus name honors Belgian botanist Jean-Édouard Bommer.[2] The basal chromosome number for this genus is 2n=60 (n=30).
As of January 2020, the Checklist of Ferns and Lycophytes of the World recognized the following species:[3]
Bommeria is a genus of small pteridaceous rock ferns, native to the New World. Genetic analysis has shown it to be a stem offshoot clade of all the cheilanthoid ferns (in family Pteridaceae), except for Doryopteris, which is an even more basal ("primitive") stem offshoot. for years, it was assumed that this genus was closely allied with Hemionitis, but genetic analysis has shown that genus to be a more advanced genus evolutionarily. The same set of analysis has shown many presumed genera within this family to be paraphyletic, but the small genus Bommeria appears to be monophyletic, or a natural genus.
Bommeria is a "gymnogrammoid" fern, exhibiting unprotected sori aligned along veins on the undersides of the fronds. This is why it was assumed to be closely allied to Hemionitis. Such a feature is strongly at odds with most pteridoid ferns (Pteridaceae), which typically have linear marginal sori with an indusium, and sometimes protected with a reflexed leaf tissue margin. Apparently, this is a trait that can arise independently, and may be an atavistic trait.
The stipes (leaf stems) of Bommeria are hairy, with some scales, and the fronds are hairy, both above and below. The hairs above and short and sharp, while the hairs below may be straight or curled. Scales are also present on the bottoms of the fronds.
The genus name honors Belgian botanist Jean-Édouard Bommer. The basal chromosome number for this genus is 2n=60 (n=30).
Bommeria es un género con 5 especies de helechos perteneciente a la familia Pteridaceae. Se encuentra en América.[1]
Son helechos terrestres; con rizoma postrado, corto a largamente rastrero, escamoso y a veces peloso con tricomas unicelulares; hojas monomorfas; pecíolos castaño a atropurpúreos, teretes a sulcados; lámina 1-16 cm, generalmente tan larga como ancha, pentagonal, pedata, profundamente lobada, el indumento del haz de tricomas unicelulares, aciculares, el indumento del envés de escamas y tricomas unicelulares, aciculares o a veces enrollados, ocasionalmente con tricomas 2-celulares con la punta glandulosa; segmentos basales conectados generalmente a los apicales por un ala angosta que corre a lo largo del raquis, el lobo basiscópico alargado a bipinnatífido; nervaduras libres y bifurcadas (en Mesoamérica), o anastomosadas, las aréolas sin nérvulos incluidos; esporangios a lo largo de las nervaduras, que cubren 2/3-3/4 de la distancia del margen a la costa, ocasionalmente se restringien hacia los márgenes; indusio ausente; parafisos ausentes; esporas globosas, la perispora crestata o reticulada; el número cromosomático es de x=30.[2]
Se distribuye por Estados Unidos, México, Mesoamérica.
Bommeria fue descrito por Eugène Pierre Nicolas Fournier y publicado en Dictionnaire de Botanique 1: 448. 1876[1877].[2] La especie tipo es: Bommeria ehrenbergiana (Klotzsch) Underw.
A continuación se brinda un listado de las especies del género Bommeria aceptadas hasta abril de 2012, ordenadas alfabéticamente. Para cada una se indica el nombre binomial seguido del autor, abreviado según las convenciones y usos.[3]
Datos: Q4940889
Multimedia:
Especies: Bommeria (Pteridaceae)
Bommeria es un género con 5 especies de helechos perteneciente a la familia Pteridaceae. Se encuentra en América.
