Lorentziella (Gigaspermaceae, Bryophyta) nuevo para Chile, y lectotipificación del género

Abstract

Lorentziella (Gigaspermaceae, Bryophyta) nuevo para Chile, y lectotipificación del género. El género Lorentziella es reportado por primera vez para Chile sobre la base de múltiples colecciones realizadas durante los meses de julio y septiembre de 2016. Se entrega información acerca de la ecología de la especie y su distribución mundial conocida, así como un mapa de distribución. Un lectotipo para el género Lorentziella es aquí seleccionado y se corrige la autoría del nombre.

Understanding the appearance of heterospory and derived plant reproductive strategies in the Devonian

“…In contrast, early steps in the evolution of heterospory in the progymnosperm Archaeopteris have been documented in Givetian lakes from semiarid environments (Marshall 1996), and the putative stem seed plant Spermasporites megaspores are likewise not found in wetland settings (Marshall and Hemsley 2003). Among extant plants, it should also be noted that lineages with large spores are not exclusively found in wetlands; bryophyte taxa with large spores above 100 μm (e.g., Archidium, Lorentiziella, some Ricca species) may occur as ephemeral taxa in seasonally dry areas (Herrnstadt et al 1980;Frahm 2000;Larraín et al 2017), and the "incipiently" heterosporous fern Pteris platyzomopsis (formerly Platyzoma; Tryon 1964) also occurs in habitats that may be only temporarily flooded. It is conceivable that in highly variable, seasonally dry environments, large spores would confer an advantage by enabling more rapid gametophyte establishment and growth, although this needs further exploration.…”

First record of the family Gigaspermaceae (Bryophyta) in Brazil

“…Larrain et al (2107) presented nomenclatural updates and disjoint phytogeographic characterization of Lorentziella imbricata between the two subtropical portions of North and South America. Larrain et al (2017) did not cite Brazilian samples and thus the occurrence of this genus remained unknown for Brazil.…”

“…Gigaspermaceae was not yet worldwide reviewed. The species currently recorded was firstly identified as Lorentziella because its cleistocarpic capsule differentiates from the nearest genus, Gigaspermum, which has a 'gymnostoma' capsule as described by Larrain et al (2017) and Seppelt et al (2012).…”

“…Lorentziella is characterized by plants with distally imbricate, concave, broadly ovate to elliptic leaves that are abruptly narrowed to a long awn; a narrow costa extending to the base of the awn and immersed to slightly emergent capsules with truncate base and undifferentiated operculum (Larrain et al 2017). According to Gradstein et al (2001), and Frey & Stech (2009) Lorentziella is monospecific (only L. imbricata), with occurrences registered for southern United States, Mexico, Uruguay, Paraguay and Argentina (Fife 1980, Gradstein et al 2001.…”