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For the chronologer/historian occasionally mentioned in the works of early Christian writers, see Thallus (historian)
Thallus (historian)

Thallus was a historian who wrote in Greek. It is uncertain when he wrote, but it was probably in the middle of the first century . His works are all lost, but a few fragments have reached us in later Ancient and Medieval writers....
.
weeds]] Thallus, from Latin
Latin

Latin is an Italic language, historically spoken in Latium and Ancient Rome. Through the Military history of the Roman Empire, Latin spread throughout the Mediterranean and a large part of Europe....
ized Greek
Greek language

Greek is an Indo-European languages native to the southern Balkan peninsula, the language of the Greek people. It forms an independent branch within Indo-European....
 ?a???? (thallos), meaning a green shoot
Shoot

Shoots are new plant growth, they can include plant stem, flowering stems with flower buds, leaves. The new growth from seed germination that grows upward is a shoot where leaves will develop....
 or twig
Twig

Twigs are critically important in identification of trees, shrubs and vines, especially in wintertime. The buds on the twig are an important diagnostic characteristic, as are the abscission scars where the leaves have fallen away....
, is an undifferentiated
Cellular differentiation

In developmental biology, cellular differentiation is the process by which a less specialized cell becomes a more specialized cell type. Differentiation occurs numerous times during the development of a multicellular organism as the organism changes from a single zygote to a complex system of Tissue and cell types....
 vegetative tissue of some non-mobile organism
Organism

In biology, an organism is any life thing . In at least some form, all organisms are capable of response to stimulus , reproduction, growth and developmental biology, and maintenance of homeostasis as a stable whole....
s, which were previously known as the thallophyte
Thallophyte

The thallophytes are a polyphyletic group of non-mobile organisms traditionally described as "relatively simple plants" or "lower plants" with undifferentiated bodies ....
s.

An organism or structure resembling a thallus is called thalloid, thallodal, thalliform, thalline, or thallose.

Even though thalli do not have organized and distinct parts (leave
Leaf

In botany, a leaf is an above-ground plant Organ specialized for photosynthesis. For this purpose, a leaf is typically flat and thin, to expose the cells containing chloroplast to light over a broad area, and to allow light to penetrate fully into the tissues....
s, root
Root

In vascular plants, the root is the organ of a plant body that typically lies below the surface of the soil. This is not always the case, however, since a root can also be aerial root or aerating ....
s, and stems
Plant stem

A stem is one of two main structural axes of a vascular plant. The stem is normally divided into nodes and internodes, the nodes hold buds which grow into one or more leaf, inflorescence , conifer cones or other stems etc....
) as do the vascular plant
Vascular plant

Vascular plants are those plants that have lignin tissue for conducting water, minerals, and photosynthetic products through the plant. Vascular plants include the ferns, clubmosses, flowering plants, conifers and other gymnosperms....
s, they may have analogous structures that resemble their vascular "equivalents".






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For the chronologer/historian occasionally mentioned in the works of early Christian writers, see Thallus (historian)
Thallus (historian)

Thallus was a historian who wrote in Greek. It is uncertain when he wrote, but it was probably in the middle of the first century . His works are all lost, but a few fragments have reached us in later Ancient and Medieval writers....
.
weeds]] Thallus, from Latin
Latin

Latin is an Italic language, historically spoken in Latium and Ancient Rome. Through the Military history of the Roman Empire, Latin spread throughout the Mediterranean and a large part of Europe....
ized Greek
Greek language

Greek is an Indo-European languages native to the southern Balkan peninsula, the language of the Greek people. It forms an independent branch within Indo-European....
 ?a???? (thallos), meaning a green shoot
Shoot

Shoots are new plant growth, they can include plant stem, flowering stems with flower buds, leaves. The new growth from seed germination that grows upward is a shoot where leaves will develop....
 or twig
Twig

Twigs are critically important in identification of trees, shrubs and vines, especially in wintertime. The buds on the twig are an important diagnostic characteristic, as are the abscission scars where the leaves have fallen away....
, is an undifferentiated
Cellular differentiation

In developmental biology, cellular differentiation is the process by which a less specialized cell becomes a more specialized cell type. Differentiation occurs numerous times during the development of a multicellular organism as the organism changes from a single zygote to a complex system of Tissue and cell types....
 vegetative tissue of some non-mobile organism
Organism

In biology, an organism is any life thing . In at least some form, all organisms are capable of response to stimulus , reproduction, growth and developmental biology, and maintenance of homeostasis as a stable whole....
s, which were previously known as the thallophyte
Thallophyte

The thallophytes are a polyphyletic group of non-mobile organisms traditionally described as "relatively simple plants" or "lower plants" with undifferentiated bodies ....
s.

An organism or structure resembling a thallus is called thalloid, thallodal, thalliform, thalline, or thallose.

Even though thalli do not have organized and distinct parts (leave
Leaf

In botany, a leaf is an above-ground plant Organ specialized for photosynthesis. For this purpose, a leaf is typically flat and thin, to expose the cells containing chloroplast to light over a broad area, and to allow light to penetrate fully into the tissues....
s, root
Root

In vascular plants, the root is the organ of a plant body that typically lies below the surface of the soil. This is not always the case, however, since a root can also be aerial root or aerating ....
s, and stems
Plant stem

A stem is one of two main structural axes of a vascular plant. The stem is normally divided into nodes and internodes, the nodes hold buds which grow into one or more leaf, inflorescence , conifer cones or other stems etc....
) as do the vascular plant
Vascular plant

Vascular plants are those plants that have lignin tissue for conducting water, minerals, and photosynthetic products through the plant. Vascular plants include the ferns, clubmosses, flowering plants, conifers and other gymnosperms....
s, they may have analogous structures that resemble their vascular "equivalents". The analogous structures have similar function or macroscopic structure, but different microscopic structure; for example, no thallus has vascular tissue
Vascular tissue

Vascular tissue is a complex conducting tissue , formed of more than one cell type, found in vascular plants. The primary components of vascular tissue are the xylem and phloem....
.

Although a thallus is largely undifferentiated in terms of its anatomy, there can be visible differences and functional differences. A kelp
Kelp

Kelp are large seaweed plants , belonging to the brown algae and classified in the order Laminariales. There are about 30 different genus. Some species can be very long and form kelp forests....
, for example, may have its thallus divided into three regions. The parts of a kelp thallus include the holdfast (anchor), stipe (supports the blades) and the blades (for photosynthesis).

The thallus of a fungus
Fungus

A fungus is a Eukaryote organism that is a member of the Kingdom Fungi . The fungi are a monophyletic group, also called the Eumycota , that is phylogeny distinct from the morphologically similar slime molds and water molds ....
 is usually called a mycelium
Mycelium

Mycelium is the Vegetative reproduction part of a fungus, consisting of a mass of branching, thread-like hyphae. The mass of hyphae is sometimes called shiro, especially within the Fairy rings fungi....
. A thallus is also commonly used to refer to the vegetative
Vegetative reproduction

Vegetative reproduction is a type of asexual reproduction for plants, and is also called vegetative propagation, vegetative multiplication, or vegetative cloning....
 body of a lichen
Lichen

Lichens are composite organisms consisting of a symbiosis association of a fungus with a Photosynthesis partner , usually either a green algae or Cyanobacteria ....
. In seaweed
Seaweed

Seaweed is a loose colloquial term encompassing macroscopic, multicellular, benthos ocean algae. The term includes some members of the rhodophyta, phycophyta and green algae....
, thallus is sometimes also called frond
Frond

A frond is a large leaf with many divisions to it, and the term is typically used for the leaves of Arecaceaes, ferns or cycads. A frond is the leaf- like structure of a fern or alga....
.

The gametophyte
Gametophyte

In plants and algae that undergo alternation of generations, a gametophyte is the multicellular structure, or phase, that is haploid, containing a single set of chromosomes:...
 of some non-thallophyte plants -- clubmosses, horsetail
Horsetail

Equisetum is the only living genus in the Equisetaceae, a family of vascular plants that reproduce by spores rather than seeds. They are commonly known as horsetails....
s, and fern
Fern

A fern is any one of a group of about 20,000 species of plants classified in the phylum or division Pteridophyta, also known as Filicophyta....
s is termed "prothallus".