A) cleistothecium
B) pycniophysis
C) sterigmata
D) none of these
Correct Answer: A
Solution :
Ascogonium is a long, errect, multinucleate unseptate, tubular female sex organ in Penicillium. With the septation of ascogonium and development of ascogenous hyphae a large number of sterile hyphae grow up arround the sexual apparatus. The ensheathing sterile hyphae get interwoven to form a hollow ball like structure the peridium. Which surrounds and protects the ascogenous hyphae as they grow and branch within. This is the ascocarp. The peridium or sheath is thicker and consists of loosely interwoven hyphae. This entire structure is spherical and has no opening. Such a closed--fruit or ascocarp is called the cleistothecium. The cleistothecium of Penicillium represents parent haplophase, dikayophase and future haplophase. In Aspergillus the swollen end of conidiophore is called vasicle. From the surface of multinucleate vasicle numerous radially arranged tubular outgrowth called sterigmata or phialids arise.
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