Thallus (tissue), an undifferentiated vegetative tissue (without specialization of function) of some non-mobile organisms, which were previously known as the thallophytes.
Thallus (historian), a chronologer/historian occasionally mentioned in the works of early Christian writers.
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KEY FEATURES: All of the above characters are diagnostic, but in particular the dimerous thallus with basal filaments composed of palisade cells, and the pore canals of tetrasporangial conceptacles lined by cells that arise from peripheral roof filaments, protrude into the pore canal, and are oriented more-or-less parallel to the roof surface.
thallus arborescent (tree-like) and flabelliform (fan-shaped) in growth form, and anchored to the substratum by a distinct holdfast and stipe;
KEY FEATURES: One of the main features of Pneophyllum is the fact that the tetrasporangial roof develop from filaments both interspersed among and surrounding the sporangia; and the pore canals of tetrasporangial conceptacles are lined by cells that are oriented more-or-less parallel to the roof surface and that may protrude into the pore canal.
Thallus, from Latinized Greek θαλλος (thallos), meaning a green shoot or twig, is an undifferentiated vegetative tissue of some non-mobile organisms, which were previously known as the thallophytes.
An organism or structure resembling a thallus is called thalloid, thallodal, thalliform, thalline, or thallose.
The thallus of fungus has been also called soma since late-20th century, but the alternative name is still uncommon.
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