| 单词 | sorus |
| 例句 | Inside the sori, spores are produced by meiosis and released into the air. Fundamentals of Biology 2015-01-01T00:00:00Z Here is a closeup, showing the fern sori I discussed here: Because I just can’t get enough of gorgeous and unusual ferns, here are some more. A Final Fern Tribute, the Witch's Hat Lichen, and an Unidentified Gelatinous Blob 2012-07-16T19:45:00.267Z When you look at the back of a fern, you might think you are looking at a pile of spores Fern sori, a collection of microscopic but structurally complex sporangia. Ferns, Secret Ninja Ferns, and their Alluring Asexual Bits 2012-05-07T11:15:00.827Z Indusium convex, fixed by a broad base partly under the sorus, commonly reflexed as the sporangia ripen. The Manual of the Botany of the Northern United States Including the District East of the Mississippi and North of North Carolina and Tennessee 2012-04-12T02:00:30.140Z The pustules, or sori, break through the cuticle in a similar manner, and here also no true peridium is present. Fungi: Their Nature and Uses They are distinguished by large leaves called fronds and small sporangia-containing structures called sori, which are found on the underside of the fronds. Fundamentals of Biology 2015-01-01T00:00:00Z This occasionally happens from the elongation of the normally placed sorus, which thus extends to the margin, and returns on the upper side, when the sori chance to be placed opposite to the marginal crenatures. Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants A good lens with needles for dissecting is very helpful in examining the sori, veins, glands, etc., as an accurate knowledge of any one of these items may aid in identifying a given specimen. The Fern Lover's Companion A Guide for the Northeastern States and Canada Sori round, borne on the veins; indusium fixed under the sorus, divided into segments or into slender filaments. The Manual of the Botany of the Northern United States Including the District East of the Mississippi and North of North Carolina and Tennessee 2012-04-12T02:00:30.140Z There is great variability in the compactness of the spores in the sori, or pulvinules. Fungi: Their Nature and Uses The photo shows small bumps called sori on the underside of a fern frond. Fundamentals of Biology 2015-01-01T00:00:00Z But it is also frequently the case that the sori are produced on the upper side, distinctly within the margin, and where there are no corresponding sori beneath. Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants Ferns with much divided leaves and short, marginal sori borne at the ends of free-forking veins, on the under side of the reflexed and altered portion of the pinnules, which serves as an indusium. The Fern Lover's Companion A Guide for the Northeastern States and Canada Sporangia borne on elevated receptacles, forming roundish sori imperfectly covered by very delicate hood-shaped indusia attached to the base of the receptacles. The Manual of the Botany of the Northern United States Including the District East of the Mississippi and North of North Carolina and Tennessee 2012-04-12T02:00:30.140Z In some species of Puccinia the sori are so compact that they remain attached to the leaves long after they are dead and fallen. Fungi: Their Nature and Uses Specimen from Monod, showing the position of the sori on the middle of the tertiary nerves. b. The Student's Elements of Geology Indusium minute, concealed beneath the sorus, divided into a few beaded hairs. The Fern Lover's Companion A Guide for the Northeastern States and Canada Pinnules triangular-oblong, bearing short sori on their inwardly reflexed margins which form the indusium. The Fern Lover's Companion A Guide for the Northeastern States and Canada Sori linear, confluent in pairs, each pair appearing like a single sorus with a double indusium opening down the middle. The Manual of the Botany of the Northern United States Including the District East of the Mississippi and North of North Carolina and Tennessee 2012-04-12T02:00:30.140Z In Botrýchium the sterile segment is more or less incised, the veins free, and the sori in a panicle or compound or rarely simple spike. The Fern Lover's Companion A Guide for the Northeastern States and Canada It is one of our handsomest evergreen ferns and even the large sori, with their dark spore cases and white indusia, are very attractive. The Fern Lover's Companion A Guide for the Northeastern States and Canada Indusium fixed beneath the sori, thin and often evanescent, either small and open, or early bursting at the top into irregular pieces or lobes. The Fern Lover's Companion A Guide for the Northeastern States and Canada The sori are borne on the backs of fertile fronds. The Fern Lover's Companion A Guide for the Northeastern States and Canada July.—Imperfectly fertile fronds sometimes occur, with the still foliaceous pinnæ cut into obovate segments with free veins and abortive sori; the so-called var. obtusilobàta. The Manual of the Botany of the Northern United States Including the District East of the Mississippi and North of North Carolina and Tennessee 2012-04-12T02:00:30.140Z As Waters remarks, "Most ferns hold the sori in the open hand, but the sensitive fern grasps them tightly in the clenched fist." The Fern Lover's Companion A Guide for the Northeastern States and Canada Fertile fronds shorter, pinnate with margins of the pinnæ revolute into a necklace form containing the sori. The Fern Lover's Companion A Guide for the Northeastern States and Canada Indusium hood-shaped, fixed centrally behind the sorus and arching over it, soon withering, often illusive. The Fern Lover's Companion A Guide for the Northeastern States and Canada Stipes and rachis dark brown and the sori short, near the midrib. The Fern Lover's Companion A Guide for the Northeastern States and Canada Indusium star-shaped, of a few irregular segments fixed beneath the sorus, often obscure. The Fern Lover's Companion A Guide for the Northeastern States and Canada Indusium cup-shaped, fixed beneath the sorus, supported by the tooth of a leaf; sporangia borne in an elevated, globular receptacle open at the top. The Fern Lover's Companion A Guide for the Northeastern States and Canada Segments linear, sharp-pointed, mostly fertile, having the margins entire and recurved, giving the sori the appearance of half-open pods. The Fern Lover's Companion A Guide for the Northeastern States and Canada Nearly all agree that the lady fern, with its variously curved sori, should be placed here, and many others would place the silvery spleenwort in the same genus, partly because of its frequently doubled sori. The Fern Lover's Companion A Guide for the Northeastern States and Canada Lobes obtuse, but appear acute when their margins are reflexed over the sori. The Fern Lover's Companion A Guide for the Northeastern States and Canada In identifying this fern the novice should bear in mind the tendency of the curved sori of youth to become straightened and even confluent with age, although such changes are rather unreliable. The Fern Lover's Companion A Guide for the Northeastern States and Canada The regular rows of nearly straight, clear-cut sori of the fertile fronds are very attractive, and the lower ones, as well as those at the slender tips of the pinnæ, are frequently double. The Fern Lover's Companion A Guide for the Northeastern States and Canada Their stipes are not jointed to the root stock, nor are their sori at the ends of the veins as in the polypodies. The Fern Lover's Companion A Guide for the Northeastern States and Canada The male fern resembles the marginal shield fern in outline, but the fronds are thinner, are not evergreen, and the sori are near the midvein. The Fern Lover's Companion A Guide for the Northeastern States and Canada The sori of this species have a peculiar beauty on account of the star-shaped indusium, as it splits into fragments. The Fern Lover's Companion A Guide for the Northeastern States and Canada |
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