| 词汇 | pinnule |
| 释义 | BETA Examples of pinnulepinnule isn’t in the Cambridge Dictionary yet. You can help! Adjacent pinnules appear fused for over half the length of the pinnules. Small pinnules are alternately arranged along the rachis, attached at c. 45°. Shorter pinnules are 2.0 mm long and 1.5 mm wide, with slightly undulate margins and rounded apex. Adjacent pinnules are narrowly confluent at the base, or in some cases somewhat constricted in the lower part. In the smaller pinnules, the veins radiate from the base. The pinnules are rounded with gently undulate margins. In the terminal part of the pinna, the pinnules are narrowly cuneate, with a rounded, shallowly dentate distal margin. Short fragments of pinnae with a relatively robust rachis (c. 0.5-1.0 mm wide rachis) bear pinnules attached at 70-80°. Larger pinnules are up to 6 mm long and 2 mm wide, parallel-sided or slightly tapered, with very undulate margins. Characteristically of this species, pinnule veins bear whitish scales with star-shaped setae. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Sori are close to fertile pinnule midveins and covered by thin indusia. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Sori occur in four pairs per pinnule lobe and lack indusia. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Sori are borne in groups of one to four per pinnule lobe. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Each vane (also called a pinnule or pinule) has a hole, slot or other indicator through which one can view a distant object. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Two to four sori occur per fertile pinnule. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. A thick midvein extends for most of the length of the pinnule. The sinuses between the lobes extend for nearly halfway between the pinnule margin and the midvein. In the larger, more lobed pinnules there is a midvein from which lateral veins are produced. The pinnules are obovate, 3-4 mm long and c. 2 mm wide. Lateral veins extend from the midvein at c. 60° and are not curved; the lateral veins fork once or in the larger pinnules twice at a wide angle. |
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