How to use thallus in a sentence

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Sentence Examples The cortical filaments are terminated by small swellings, called utricles, which form the external surface of the thallus. Filaments are typically tightly twisted and bundled, but may become separated in the middle part of the thallus. The thallus and rhizoid can be distinguished by their different patterns of cell division. Ceratopteris spores, like fucoid zygotes, divide unequally to produce a small rhizoid cell and a larger cell that develops into the thallus. The plant form of the thallophytes is an undifferentiated thallus lacking true roots, stems, and leaves. The minute branchlets of the yellow thallus produce the irregularly radiated and crinite appearance of the margins of the fruit. The receptacle remains on the thallus surface until the receptacle's sporophytes approach maturity. In addition to the algae in lichens, bacteria are invariably associated with the lichen thallus. It rarely fructifies but the thallus varies in size, amount of division and cusping as well as colour. Isidia are extensions of the surface of the thallus and may be cylindrical, globular, brachiate or lobula. Crustose lichens may have a hypothallus i.e., an algal-free mat of hyphae extending beyond the margin of the regular thallus. The gametophyte is a small ribbonlike thallus that resembles a thallose liverwort. Ancestors of the esorediate and esquamulose endemics of genus Cladina may have reached the islands by means of easily disintegrating thallus fragments. The more common type of thallus, a heteromerous thallus, has four distinct layers, three of which are formed by the fungus and one by the alga. This thallus structure with dimerous organization allows Arenigiphyllum to be compared with extant members of Corallinales, both Corallinaceae and Sporolithaceae. In addition, the thallus of Ulva is sheet-like and as production increases it can grow unattached forming layers or mats in the water column. The metabolic activity of lichens is greatly influenced by the water content of the thallus. The medulla, located below the algal layer, is the widest layer of a heteromerous thallus. Cavities in the thallus sometimes contain colonies of the blue-green alga Nostoc. Lichen whose thallus resembles leaves or lobes that are loosely attached to their substrate and can be easily removed. Show More Sentences Its thallus is shaped like a miniature tree several centimetres long with branches of a few millimetres, so that it resembles a coral. Apart from this we have the typical food of the country thallus Acompaar for our dishes and traditional Sarteneko. Lichen whose thallus forms a crust that is firmly attached to its substrate. The blue-gray, pruinose apothecia and green leprose thallus are good diagnostic features of this lichen. In lichens, the fungus forms a thallus or lichenized stroma that contains characteristic secondary metabolites. Is it merely that the photobionts are mainly unicellular in the lichen thallus and as such have little capability for diversity and adaptation? The use of thallus fragments to produce plantlets by vegetative growth removes the need for fertile material and spore production. The fungus forms a thallus or lichenized stroma that may contain characteristic secondary metabolites in all lichens. The inconspicuous thallus and numerous small, plane, deep reddish orange apothecia with concolorous margins are characteristic. The homoeomerous type of thallus consists of numerous algal cells distributed among a lesser number of fungal cells, while the heteromerous thallus has a predominance of fungal cells. The vegetative thallus is composed of intercellular hyphae that produce globular haustoria which penetrate into host cells allowing the obligately biotrophic fungus to absorb nutrients. In fungi, the rhizoid is found in the thallus and resembles a root. A soredium, consisting of one or several algal cells enveloped by threadlike fungal filaments, or hyphae, may develop into a thallus under suitable conditions. The alga also may contribute a substance that causes structural changes in the fungus since it forms the typical lichen thallus only in association with an alga. The thallus, or flat, gametophyte, usually lacks a midrib. The fucus genus is found in large quantities on European coasts and in particular contains the species Fucus vesiculosus and serratus, which are brown algae with a branched ribbon-like thallus. These are toxic metabolites produced by certain molds, which may be contained in the spore, the thallus or excreted in the substrate on which the mold has grown. Lichens are grouped by thallus type, since the thallus is usually the most visually prominent part of the lichen. Structures involved in reproduction often appear as discs, bumps, or squiggly lines on the surface of the thallus. The thallus form is very different from any form where the fungus or alga are growing separately. Show More Sentences The medulla is the lowest layer, and may form a cottony white inner core for the branchlike thallus, or it may be hollow. In squamulose lichens the part of the lichen thallus that is not attached to the substrate may also appear leafy. The thallus must be saturated with liquid water for cyanobionts to photosynthesize. Because of the relative lack of differentiation in the thallus, the line between diaspore formation and vegetative reproduction is often blurred. Some of the more familiar species grow as a flattened leafless thallus, but most species are leafy with a form very much like a flattened moss. However, spatial and temporal patterns of thallus morphology and sporophyte reproduction have not been investigated in Southern California. The nonreproductive tissues, or vegetative body parts, is called the thallus. Elaphoglossum amygdalifolium also differs from the general form of the genus by lacking both marginal rhizoids on the thallus and waxy caps on the hairs. The thallus is made up of filaments of the fungus called hyphae. Distinguishing features among the studied species are size of the spores, germination time, time of formation of the gametangia, and thallus margin shape. More than one phycobiont may be present in a single thallus. Also lacking stomata and a cuticle, lichens may absorb aerosols and gases over the entire thallus surface from which they may readily diffuse to the photobiont layer. The different morphological phases of the thallus are mainly modified by temperature and pluriseriate ribbon-like thalli form under lower water temperatures. Examples from Classical Literature The necks of the archegonia hardly project above the general surface of the thallus. A section through the thallus of Nephroma helvetica, showing the cortices, upper and lower, and the mycelial medulla within. On shaded sandstone, intermingled with an ash-gray, crustose thallus, which appeared like a sterile Pertusaria. Notothylas resembles Anthoceros in its thallus, but the sporogonium is much smaller. The algal hosts are usually Dactylococcus or Polycoccus, and both hosts are sometimes found in the same thallus. Tuck., with much stronger, darker thallus and apothecia on the whole larger. Piece of thallus of Parmelia conspersa, with section through an apothecium. The reproductive organs borne by the thallus or plant are called antheridia and archegonia, and serve for sexual reproduction. The young sporogonium is protected by a thick calyptra derived from the tissue of the thallus around the archegonium. The vegetative body of a thallophyte is a thallus, and corresponds to stem and leaf. The structure of the thallus may serve to represent that of most of the Lichens. As a matter of fact, thallus, whom you mentioned, needs a doctor rather than a magician. So Peter went back with the boy to the house of thallus, and next day began to visit the prisons once more. Involucres sessile, obconic or pyriform, perforated at the apex, continuous with the thallus at base. Antheridia in an oval or obcordate disk immersed in the apex of the thallus. In these there is a thallus which starts from a central point and continually divides in a forked or dichotomous manner. Antheridia immersed in the thallus, covered with dentate scales. The thallus does not yet show this important morphological division. Plant-body a dichotomously branching thallus, terrestrial or aquatic. Capsules immersed in the thallus or sessile upon it, indehiscent. Show More Sentences This, in contradistinction to the leafy shoot, is termed a thallus. The colouring matter is ready formed and abundant in the thallus. Find more words! 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What is the opposite of thallus? Words that rhyme with thallus What is the plural of thallus? Use our Sentence Generator Nearby Words thallophytic thalloid thallium thalli thalidomide thalian thalweg Tham thame Thames than Than 7-letter Words Starting With t th tha thal thall thallu