Pycniospore

Pycniospores are a type of spore found in certain species of rust fungi.[1][2] They are produced in special cup-like structures called pycnia or pynidia. Almost all fungi reproduce asexually with the production of spores. Spores may be colorless, green, yellow, orange, red, brown or black.

Lettuce Diseases. a. Drop, h. Septoria leaf spot, c. same as b. but older spots, d. pycnida, e. pycniospores

Other types of spore
a. Phomosis spot on eggplant leaf, b. pycniospores, c. conidiophores, d. stylospores
Sporangiospores

Sporangiospores (spore:spore, angion:sac) are spores formed inside the sporangium which is a spore sac.

Conidia

Conidia (singular: conidium) are spores produced at the tip of special branches called conidiophores.

Oidia

Oidia (singular: oidium). In several fungi, the hyphae is often divided into a large number of short pieces by transverse walls. Each piece is able to germinate into a new body. These pieces are called oidia (small egg).

Chlamydospores

Chlamydospores (chlymus: mantle) are produced like oidia but differ from oidia in being thick walled. They are either terminal or intercalary.

References
  1. Allaby, Michael (29 March 2012). A Dictionary of Plant Sciences. OUP Oxford. p. 420. ISBN 978-0-19-960057-1.
  2. Rijkenberg, F. H. J.; Truter, Susarah J. (1974). "The Ultrastructure of Sporogenesis in the Pycnial Stage of Puccinia Sorghi". Mycologia. 66 (2): 319–326. doi:10.1080/00275514.1974.12019605. ISSN 0027-5514.


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