On the Vegetative Multiplication of Chondria
نویسنده
چکیده
As far as we know, there is no single case recorded where vegetative multiplication, by a body having dense cellular structure, was observed in any algae belonging to Florideae. Schrnitz and Hauptfleiscli tell us in Fngler and Prantl's Die nattirlichen Pflanzenfamilien"2~ that vegetative multiplication is not known almost entirely in Rlaodophyceae. It is known, in Ban giaceae, some cells remain alive while others die of and those living cells develope into new plants. In Alelobesia call itltarnnioides Fkbg.,3> fan-shaped Brutknospen" are said to develope to new individuals. Those instances together with some motiospores are all we know as something like the reproduction of this kind in Florideae. It would not be without some interest to mention here about an instance of true vegetative multiplication in a plant belonging to RItodoynelaceae, that is Chondria crassicaulis IIarv.4> As I shall state later on, I can not agree with J. Agardh's opinion with regard to the systematic position of this alga. It has a wider range of distribution in this country, growing on rocks between tide-marks, both along the coasts of the Pacific and the Japan Sea. No one has yet discovered reproductive cells in this plant except tetrasporangia,5~ and whenever I happened to come in contact with the
منابع مشابه
Comparative performance of in vitro multiplication in four grape (Vitis spp.) rootstock genotypes
The magnitude of demand for planting materials in grape, mainly for rootstock genotypes indicates that micropropagation is inevitably necessary for their mass scale propagation. Therefore, the studies on micropropagation of four genetically different grape rootstocks namely Dogridge (Vitis champini), SO4 (V. riparia× V. berlandieri), H-144 (V. vinifera × V. labrusca) and 3309 C (V. riparia × V....
متن کاملA New Parallel Matrix Multiplication Method Adapted on Fibonacci Hypercube Structure
The objective of this study was to develop a new optimal parallel algorithm for matrix multiplication which could run on a Fibonacci Hypercube structure. Most of the popular algorithms for parallel matrix multiplication can not run on Fibonacci Hypercube structure, therefore giving a method that can be run on all structures especially Fibonacci Hypercube structure is necessary for parallel matr...
متن کاملThe efects of diferent kinds and cocentrations of carbon sorbon source on in vitro shoot multiplication of persian wainut
متن کامل
A note on primary-like submodules of multiplication modules
Primary-like and weakly primary-like submodules are two new generalizations of primary ideals from rings to modules. In fact, the class of primary-like submodules of a module lie between primary submodules and weakly primary-like submodules properly. In this note, we show that these three classes coincide when their elements are submodules of a multiplication module and satisfy the primeful pr...
متن کاملMultiplication operators on Banach modules over spectrally separable algebras
Let $mathcal{A}$ be a commutative Banach algebra and $mathscr{X}$ be a left Banach $mathcal{A}$-module. We study the set ${rm Dec}_{mathcal{A}}(mathscr{X})$ of all elements in $mathcal{A}$ which induce a decomposable multiplication operator on $mathscr{X}$. In the case $mathscr{X}=mathcal{A}$, ${rm Dec}_{mathcal{A}}(mathcal{A})$ is the well-known Apostol algebra of $mathcal{A}$. We s...
متن کامل