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