The phrase "are usually recognized" is correct and usable in written English.
It can be used when discussing something that is commonly acknowledged or accepted in a general context.
Example: "In many cultures, certain symbols are usually recognized as representations of peace."
Alternatives: "are often acknowledged" or "are typically accepted".
Persons with this disorder are usually recognized early in life, and few survive to adulthood.
Registration certifications of Thoroughbred horses in one nation are usually recognized by other Thoroughbred registering organizations.
In humans, five different classes, or modalities, of taste are usually recognized: sweet, salt, sour, bitter, and umami.
Several genera are usually recognized for certain specialized gulls, but many authorities place these in the broad genus Larus.
Six to nine subspecies are usually recognized; they differ in the colour and size of the winter neck-ruff of males, as well as in the colour of their saddle patches and in their horn shape.
Four species are usually recognized: the golden, or Asiatic, jackal (C. aureus), found from eastern Europe to Southeast Asia, the African golden wolf (C. anthus), found in northern and eastern Africa, and the black-backed (C. mesomelas) and side-striped (C. adustus) jackals of southern and eastern Africa.
She's usually recognized only by teenagers.
To buttress his case, he considers four famous revolutions, in each of which, he argues, bloodshed actually played far less of a role than is usually recognized.
The eastern boundary is usually recognized as 108th Street — give or take a few blocks in either direction — and the western section of Aqueduct.
He was practically always there except when he was out on some imposturous jaunt or other, yet he was usually recognized and picked up by the police while he was jaunting around, rather than tracked down by them to his home in Brooklyn.
The main reason behind this is usually recognized in terms of augmented electrochemical active surface area.
