Original paper

Studies on Hepaticae LXVI - Lepidoziaceae subfamily Zoopsidoideae (3): Zoopsidella

Schuster, R.M.

Nova Hedwigia Band 69 Heft 1-2 (1999), p. 101 - 149

23 references

published: Aug 1, 1999

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Abstract

One of the most highly specialized genera of Zoopsidoideae is revised: Zoopsidella Schust. (with 8 spp. in 3 subgenera, Hyalolepidoziopsis Schust., Hypozoopsis Schust., Zoopsidella Schust.). Within Zoopsidella and its allies, Monodactylopsis and Pteropsiella, we see repeated reduction (from a "generalized" stem with 12 cortical + numerous medullary cell rows to a highly derivative one, with 4 cortical + 1 medullary cell rows). Unlike in some other subfamilies (and genera) of Lepidoziaceae (i. a., Lepidozioideae, Bazzanioideae, Micropterygioideae, Lembidioideae), as well as Zoopsis, in which - with rare exceptions - unisexuality prevails; in Zoopsidella almost all taxa are autoecious (one even exists as a paroecious subspecies), aside from Z. integrifolia. All taxa treated, even the most robust, have a reduced (8+4-seriate) seta anatomy. Within the genus there is evolution from malleable branching modes to, more usually, ramification via only ventral-intercalary branches. These two features - or phylogenetic tendencies - seperate Zoopsidella (as well as Pteropsiella and Monodactylopsis) from Zoopsis. A third "tendency" exists: oil-bodies, within Zoopsidella, show a tendency to become smaller and fewer and, ultimately, to become vestigial on lacking in many or most cells. Such tendencies fail to exist in other Zoopsidoideae known from living plants.

Keywords

HepaticaeLepidoziaceaeZoopsidoideaeZoopsidella