different between aecium vs aecidium

English

Alternative forms

• æcium

Etymology

From New Latin, from Ancient Greek ????? (aikía, “injury, insult”).However Merriam-Webster relates that aecium is a back-formation from aecidium and is not related to the Greek aikía. The word aecium was "introduced as a substitute for aecidium by the Purdue University plant pathologist J. C. Arthur (1850-1942) in an effort to reform terminology for rust fungi; see Terminology of the Spore-Structures in the Uredinales, Botanical Gazette, vol. 39 (Mar., 1905), pp. 219-22."

Pronunciation

• IPA^(key): /?is.i.?m/

Noun

aecium (plural aecia or aeciums)

1. (mycology) A cuplike fruiting structure of some parasitic rust fungi that contains chains of aeciospores.
   • 1932 August, Ralph Ulysses Cotter, Factors Affecting the Development of the Aecial Stage of Puccinia Graminis, US Dept of Agriculture, Technical Bulletin No. 314, page 29,

     The writer therefore made observations to determine the conditions under which the aecia open and discharge spores most readily.

   • 2010, N. K. Soni, Vandana Soni, Fundamentals of Botany, Volume 1, page 127,

     The receptive hyphae with binucleate cells eventually form the basal cells of the aecium. […] Many cup-like structures, called aecia, appear on the lower surface of leaf.

   • 2010, M. S. Patil, Anjali Patil, 16: The Rust Fungi: Systematics, Diseases and Their Management, Arun Arya, Analía Edith Perelló (editors), Management of Fungal Plant Pathogens, page 209,

     It is a heteroecious rust and its aecia are produced on species of Oxalis, namely O. stricta, according to Arthur (1929).

Related terms

• aecial
• aecidium

See also

• pycnium

References

• aecium at OneLook Dictionary Search
• aecium in The Century Dictionary, New York, N.Y.: The Century Co., 1911.

English

Alternative forms

• æcidium

Etymology

From New Latin aecidium, the diminutive form of Ancient Greek ????? (aikía, “injury”).However Merriam-Webster takes the origin from the Greek ???????? and refers to the botanist John Hill, in his A General Natural History, or New and Accurate Descriptions of the Animals, Vegetables, and Minerals, of the Different Parts of the World, vol. II, A History of Plants (London: Printed for Thomas Osborne, 1751), p. 64: "We have called this genus, distinguished by its peculiar cells, Æcidium, from the Greek ????????, cellula."

Pronunciation

• (Received Pronunciation) IPA^(key): /i??s?d??m/

Noun

aecidium (plural aecidia or aecidiums)

1. The cupulate fruiting body borne upon the mycelium of certain fungi commonly parasitic upon specimens of the Compositae, Lamiaceae, Leguminosae, and Ranunculaceae families
2. (mycology) A member of the form genus Aecidium.

Related terms

Translations

See also

• teliospore
• urediniospore

References