By Jill Tucker, San Francisco Chronicle

The teacher shortage across California is getting worse, hitting urban districts hardest, but pinching even rural and suburban schools as well, according to a survey released last week.

As a result, students are seeing a revolving cast of substitutes, canceled courses and less qualified teachers in their classrooms, according to district officials who were surveyed.

Across the state, 75 percent of districts reported a shortage of teachers this school year, including 80 percent of urban districts and 69 percent of schools in the suburbs, according to the poll conducted by the California School Boards Association and the Learning Policy Institute, an education research nonprofit.

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