4b). In their general appearance, the crystals somewhat CP673451 supplier resemble the needle-like calcium oxalate crystals that cover the hyphal surfaces of some fungi. Such crystals are formed when oxalic acid secreted by the fungus combines with
external calcium to produce calcium oxalate (Dutton and Evans 1996). However, only carbon and oxygen were detected from the epithecium surface of C. proliferatus in EDX analyses. Occurrence and ecological role of proliferating ascocarps The ascomata of many species of Mycocaliciales can occasionally have a capitulum in which the apothecial disk is divided into several distinct regions or lobes. Asci tend to first mature in the central sections of the hymenia and when more asci mature, the hymenium expands and the capitulum surface become increasingly convex. Irregularities in ascus production can easily lead to the development of several hymenial convexities or lobes per capitulum. Many Chaenothecopsis species can also occasionally produce branched ascocarps, and these structures appear to be especially common in resinicolous species with long and slender stipes, such as C. oregana Rikkinen and C. diabolica Selleckchem Captisol Rikkinen & Tuovila. However, ascocarp braching is not confined only to resinicolous species, but also occurs in some lichen-associated and lignicolous species such as C. haematopus Tibell and C. savonica
(Räsänen) Tibell, which typically grow on lignum in shaded microhabitats. Branching also occurs in some species of Mycocalicium Vain., Phaeocalicium A.F.W. Schmidt and this website Stenocybe Nyl. ex Körb. For example, Stenocybe pullatula (Ach.) Stein can produce several capitula from the same stipe, with the youngest at the tip and the older, senescing capitula appearing as a whorl directly below. This species produces ascocarps on the bark of Alnus species. In the resinicolous Chaenothecopsis nigripunctata
branching mainly occurs very close to the tip of the stipe, with each short branch forming a separate apothecial head. Profuse branching often leads to the development of compound capitula, consisting of up to twelve partially contiguous apothecial heads Dimethyl sulfoxide (Rikkinen 2003b). Mycocalicium sequoiae Bonar also produces clusters of apothecial heads on a common stipe (Bonar 1971). However, in this species the stipes tend to branch lower and hence have longer branches and less confluent apothecial heads than in C. nigripunctata. Also the related C. montana Rikkinen can produce branched ascocarps, but more rarely than the other two species (Tuovila et al. 2011b). While the ascomata of C. nigripunctata and its closest relatives mainly branch from the upper part of the stipe, their ascocarps do not usually form multi-layered groups via branching and proliferation through the hymenium in the way exhibited by the proliferating fossil from Bitterfeld amber and many specimens of C. proliferatus. However, similar branching is quite common in the resinicolous C. dolichocephala and C.