An indusium or veil surrounding the stipe and dependent from its apex beneath the pileus.
Stipe without an indusium or veil dependent from its apex.
The little heaps of capsules or sori are consequently not pollen, but a nest of seeds surrounded by an indusium or veil, which, probably, corresponds to the ovary.
The calyptra probably corresponds to the arillus and thus to the bud-scales; or possibly to the indusium of the ferns, and thus to the ovary.
The indusium is the upraised epidermis, which opens in a spathose manner; it consequently stands in the signification perhaps of the floral spathe or involucrum.
How curious that the indusium should first so cleverly collect pollen and then afterwards push it out!
I find that in bud the indusiumcollects all the pollen splendidly, but, differently from Leschenaultia, cannot be afterwards easily opened.
I have just examined a large bud with the indusium not yet closed, and it seems to me certain that there is no stigma within.
Finally the style emerges from the indusium (590/3.
In Lobelia the stigma, before it is mature, pushes by its circular brush of hairs the pollen out of the conjoined anthers; here the indusium collects pollen, and then the growth of the stigma pushes it out.
In most genera of the order the pollen is pushed out of the indusium by the growth of the style or stigma, very much as occurs in Lobelia or the Compositae.
Indusium entirely concealed beneath the sorus, divided into very narrow segments or reduced to minute hairs.
Sporangia at or near the ends of the unconnected veins, borne on the under surface of the frond; indusium various.
Indusium flat or slightly convex, orbicular or round-reniform, fixed by the centre, opening all round the margin.
Indusium evident, round or roundish, covering the sporangia, at least when young.
Indusium of a few broad segments, at first covering the sorus completely.
Indusium fixed by its outer margin to the fruitful veinlet, free and opening on the side next the midrib.
Indusium convex, fixed by a broad base partly under the sorus, commonly reflexed as the sporangia ripen.
Sori linear, confluent in pairs, each pair appearing like a single sorus with a double indusium opening down the middle.
Some species with continuous indusium connect this genus very closely with the next.
The indusiumis orbicular-reniform, and almost always smooth.
Rarely the sinus is so deep that the indusiumat last becomes divided.
The indusium is thin and delicate, composed of sinuous-margined cellules, and is more or less wavy along the free edge.
In the areoles of the second series the sori are opposite: the indusium of the lower one free toward the costa; of the other, in the opposite direction.
The sori are quickly confluent, and all trace of the indusium is soon lost.
These sporangia are seen to grow out from the sides of a mass of special tissue, known as the placenta, from which the indusium really arises.
It is from the resemblance of this indusium to a bladder that the plant has received its popular name.
These are covered at first by an indusiumwhich is notched after the manner of that of the Buckler Ferns.
Thus it is proper to describe the shape of the indusiumas peltate.
The indusium disappears as soon as the sporangia become mature, and eventually the sori may spread over the whole of the back of the pinna or pinnule.
The indusium arises from a vein to which the sorus is attached.
The indusium is not clearly linear, being more in the shape of a horseshoe, but this character can only be recognized before the delicate covering has started to shrivel.
The sorus is circular and is covered with an indusium which is notched or kidney-shaped.
In this case the sorus is always near to the margin of the leaf, and the indusiumor covering is cup-shaped.
In the early days the indusium is of a lead colour, but as the sporangia ripen underneath the brown colouring shows through the thin covering.
He dwelt on the similarity of the sporangium and indusium of Azolla to a gymnospermus ovule, and regarded the filaments of Anabena seen penetrating within the indusium as probably the fertilising bodies in this naked-seeded cryptogam.
I will bear this in mind, as certain forms of Pteris or its affinities lead me to suspect that in these tribes the indusium may be a long way from the margin, and yet be, quoad origin, marginal; this section illustrates my meaning.
At maturity theindusium of the Common Bladder Fern usually disappears, leaving the fruit-dot naked, while that of the Obtuse Woodsia is fastened underneath the fruit-dot and splits apart into jagged, spreading lobes.
In outline the fragile bladder fern suggests the blunt-lobed Woodsia, but in the latter the pinnæ and pinnules are usually broader and blunter, and its indusiumsplits into jagged lobes.
Sporangia borne on an elevated, globular receptacle in a membranous, cup-shaped indusiumwhich is open at the top.
Indusium fixed beneath the sori, thin and often evanescent, either small and open, or early bursting at the top into irregular pieces or lobes.
Illustration] Short, indusium usually more or less curved and frequently crossing a vein.
The indusium whitish and sometimes herbaceous, formed of the reflexed margin of the lobes or of the whole pinnule.
Indusium fixed under the sporangia, appearing like a tiny green cup filled with spore cases.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "indusium" in a variety of sentences. We hope that you will now be able to make sentences using this word.
