Definition of Ophioglossum : the type genus of the family Ophioglossaceae comprising the adder’s-tongues and having a solitary simple frond with netted venation and a terminal spike formed of two rows of coalescent sporangia.
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What is the meaning of Ophioglossum?
Definition of Ophioglossum : the type genus of the family Ophioglossaceae comprising the adder’s-tongues and having a solitary simple frond with netted venation and a terminal spike formed of two rows of coalescent sporangia.
How do Psilotales reproduce?
The sporophyte reproduces asexually by the formation of spores. Spores are produce in special tri-lobed structure called synangia. At maturity, many of the dichotomously branched aerial shoots become fertile and produce tri-locular sporangia known as synangia.
What is the common name of Ophioglossum?
California adder’s tongue
Ophioglossum californicum, known by the common name California adder’s tongue, is an uncommon species of fern in the family Ophioglossaceae.
Which plant is commonly called adder’s tongue?
The adder’s-tongue fern is so-named because the tall stalk that bears its spores is thought to resemble a snake’s tongue. An indicator of ancient meadows, it can be found mainly in southern England.
How many species of Ophioglossum were there in India?
Of the eight Ophioglossum species (O. costatum R. Br., O.
How many chromosomes does Ophioglossum?
number of chromosomes Ophioglossum reticulatum has 1,440 chromosomes, the highest number of any organism known to science. Among homosporous ferns, exceptions to the rule of high chromosome numbers are rare; in one species of filmy fern (Hymenophyllum peltatum), x = 11, the lowest number reported.
Why Psilotum is called primitive?
This is primarily because psilophytes are the only living vascular plants to lack both roots and leaves. Though they have been considered “primitive,” recent developmental and molecular evidence suggests that the group may actually be reduced from fern-like ancestors.
How many chromosomes are there in Ophioglossum?
Is Ophioglossum a Pteridophyte?
Among pteridophytes, Ophioglossum L. is one of the most important fern genus from an evolutionary point of view.
Is adder’s tongue poisonous?
In July the crimson red berries appear as the spathe dies off and shrivels away. Needless to say these are poisonous and can be fatal if eaten by children which is why the name Adder’s Tongue came into use.
Is adder’s tongue fern rare?
The Least Adder’s-tongue fern is an annual winter fern which is nationally rare (growing only on Scilly and in the Channel Islands).