Aleuria

Abstract: Syntheses of the Enantiomeric Aleuriaxanthins. Detection of a Predominant (Z)-Aleuriaxanthin in Aleuria The enantiomeric C10-building blocks 9 ((+)-(2 E, 6 R)-6, 7-dihydroxy-3, 7-di methyl-2-octen-l-yl acetate) and ent-9, and 11 ((+)-(2 E, 6 R)-3, 7-dimethyl-2, 7-octadien-l, 6-diyl diacetate) and ent-11, prepared from the optically active epoxy-geraniols 7 and ent-7, respectively, have been used for the syntheses of (2′ R)-aleuriaxanthin (1) and (2′ S)-aleuriaxanthin (ent-1). At room temperature aleuriaxanthin exhibits no significant CD. nor ORD. However, at −180° a very distinct CD. was observed, which in the UV. range showed a surprising resemblance to that of (3 R, 3′ R)-zeaxanthin. By direct comparison of 1 with aleuriaxanthin isolated from Aleuria aurantia [2], the (2′ R)-chirality assigned to the latter by Liaaen-Jensen et al. [5] is confirmed. HPLC. separation of the mixture of carotenoids from Aleuria shows the presence of a predominant (Z)-aleuriaxanthin of yet undetermined structure.

Abstract: Morphological, developmental, and cytochemical studies were made on the apical apparatus of nine members of the families Otideaceae and Aleuriaceae, referred to as the Otidea–Aleuria complex, and A...

Abstract: Species of Cheilymenia, Coprobia, and Scutellinia of the Ciliarieae (Humariaceae) are studied by electron microscopy. They share the same type of ascosporogenesis, although only Cheilymenia and Coprobia form spore sheaths on their ascospores, and epispore layers are formed after the primary wall is deposited between spore-delimiting membranes. The manner of formation of epispore layers is very similar to that in the genus Aleuria. Gradual condensation of the secondary wall material in the perisporic sac is consistently found. Globular bodies with rodlet contents are found in the perisporic sac of Cheilymenia and are different from those found in Aleuria. Vacuolation occurs in the perisporic sac, within which ornaments are almost completely formed. During the condensation of secondary wall material, a translucent zone similar to that commonly found in Ascobolus and other coprophilous fungi is formed between the epispore layer and the ornaments.