The protein coat around a virus is called :

The protein coat around a virus is called capsid. Capsid is made of small subunits called capsomeres. Capsid protects the nucleic acid.
On the stem the epidermal hairs are called trichomes. The trichomes in the shoot system are usually multicellular. They may be branched or unbranched and soft or stiff. They may even be secretory. The trichomes help in preventing water loss due to transpiration.
Glycocalyx may be thick and tough, called the capsule. Capsule is made up of polysaccharides and amino acids. Capsulated bacteria are highly virulent.