The document is a table with information about different forms of thallus and their characteristics. The columns are 'Form of thallus', 'Characteristics of structure', and 'Characteristics of vital activity'. The rows represent different forms of thallus: 'Crustose', 'Foliose', and 'Fruticose'. There is also handwritten text in some cells.

The provided image contains a table with the title "Characteristics of different forms of thallus". The table is structured into three columns: "Form of thallus", "Characteristics of structure", and "Characteristics of vital activity". The rows list three forms of thallus: "Crustose" (Накипные), "Foliose" (Листовые), and "Fruticose" (Кустистые). In the "Characteristics of structure" column for "Crustose" thallus, there is handwritten text that translates to: "The most primitive type - squamous, consists of accumulations of individual lumps of algae." In the "Characteristics of vital activity" column for "Crustose" thallus, there is handwritten text that translates to: "Grows with its periphery, and shrubby - with its tips." The cells for "Foliose" and "Fruticose" thallus under both "Characteristics of structure" and "Characteristics of vital activity" are empty in the printed part of the table.