Antibiotic biosynthesis: Cephalosporins—antibiotics structurally and functionally related to penicillins—are produced industrially by species of which genus?

Introduction / Context:
Cephalosporins are beta-lactam antibiotics discovered from marine fungus-like organisms and later produced industrially. Recognizing the original producing genus is a core fact in pharmaceutical microbiology and provides context for semisynthetic derivative development and strain improvement programs.

Given Data / Assumptions:

• The question asks for the producing genus of cephalosporins.
• We compare plausible genera including bacteria and fungi.
• Historical naming conventions are acceptable (modern taxonomy notes apply but the canonical exam answer remains).

Concept / Approach:
The classic producer is Cephalosporium (now placed in genus Acremonium in modern taxonomy). Industrial processes historically cited Cephalosporium acremonium as the source. While taxonomic updates exist, examinations and many references still use “Cephalosporium” for canonical pairing with cephalosporins.

Step-by-Step Solution:

Verification / Alternative check:
Pharmaceutical microbiology texts and historical discovery accounts affirm Cephalosporium as the source organism for cephalosporin C, the parent compound for many semisynthetic cephalosporins.

Why Other Options Are Wrong:

• “Cephalospodium” is a misspelling/nonstandard genus.
• Pseudomonas and Bacillus produce other metabolites but not cephalosporin C.
• Penicillium is linked to penicillin, not cephalosporins.

Common Pitfalls:
Confusing penicillin and cephalosporin producers; overlooking taxonomy changes that do not affect the exam-style answer.

Final Answer:
Cephalosporium