| 词汇 | prothallus |
| 释义 | BETA Examples of prothallusprothallus isn’t in the Cambridge Dictionary yet. You can help! If conditions are right, a spore will germinate and grow into a rather inconspicuous plant body called a prothallus. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The prothallus is red to whitish in the inner part, red the in outer part. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This eventually results in the formation of a notch at the anterior edge of the prothallus, giving it a roughly heart-shaped appearance (cordate). From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The haploid prothallus does not resemble the sporophyte, and as such ferns and their allies have a heteromorphic alternation of generations. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. One of the cells at the top margin of the prothallus then divides obliquely when it has 5, 10, or more cells across its width. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Young fern sporelings can often be found with the prothallus gametophyte still attached at the base of their fronds. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The gametophyte of some non-thallophyte plants -- clubmosses, horsetails, and ferns is termed prothallus. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Rhizoids anchor the prothallus to the soil. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. |
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