Clouds

Stratus

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Cumulus

Photo: International Cloud Atlas

Cirrus

Photo:  International Cloud Atlas

Stratocumulus

Photo:  International Cloud Atlas

Cumulonimbus

Photo:  International Cloud Atlas

Aircraft condensation trails

Photo:  International Cloud Atlas

Aircraft condensation trails

These are clouds that form on the track of an aircraft when the atmosphere at the level of the flight is sufficiently cold and humid. The low temperature of the air causes the water vapor to freeze instantly, forming a trail of ice crystals. During the formation of contrails , airflow can cause traces of turbulence mats. According to the International Cloud Catalog (WMO), aircraft condensation trails ( contrails ) that persist for at least 10 minutes are named after the genus Cirrus , followed by the specific name of the cloud " homogenitus ", being classified as Cirrus homogenitus . 

https://cloudatlas.wmo.int/aircraft-condensation-trails.html

The International Cloud Atlas of the World Meteorological Organization (WMO) contains the description and classification of clouds. Go to:  https://cloudatlas.wmo.int/home.html