Cirrostratus spreads as a pale, translucent veil, sometimes smooth and sometimes fibrous. Halos are characteristic companions of this cloud type. The photo shows a ring around the Sun within the veil, rather than a separate row of puffy clouds.
It belongs here because a cloud need not have a crisp edge to be recognizable. Compare its continuous, delicate coverage with individual cirrus strands and the thicker look of altostratus. Observe the surrounding sky without staring at the Sun. A halo is a useful clue, not a complete weather forecast.
Photo: Franz van Duns · CC BY 4.0. Resized and recompressed; image retains its source license.
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