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. 2015 Jan 13;5:788. doi: 10.3389/fmicb.2014.00788

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Copyright © 2015 Rohlfs.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Images depicting the localized formation of guttation droplets on the sexual fruiting bodies (cleistothecia) of A. nidulans, which are possibly involved in mediating protection from grazing by Collembola (see Döll et al., 2013). (A) To the left of the initial stage (primodium) of a cleistothecium (asterisk) a strikingly large droplet (arrow) is formed in addition to some smaller ones. The whitish appearance of the primordium is due to layers of so-called Hülle cells which are assumed to nurse and protect the developing ascospores within the cleistothecium. It is not obvious whether the guttation droplets are produced by the Hülle cells or aerial hyphae surrounding the fruiting bodies. (B) A cluster of larger cleistothecia (asterisk), surrounded by a dark mat of conidia-producing tissue. The cluster is covered by voluminous droplets of light-brown color (arrow). Numerous smaller and apparently colorless droplets attached to single aerial hyphae are also visible.