Baeumleria nothofagi (Henn.) Petr. & Syd. 1927
Details
Nomenclature
Classification
Descriptions
Baeumleria nothofagi (Henn.) Petr. & Syd. 1927
Conidiomata initially subcuticular (subepidermal in NZFRI 2334), epidermal cells often becoming invaded (at least in part) as conidiomata mature, host cells otherwise remaining more or less intact; intercellular spaces in the leaf immediately below and around conidiomata containing scattered hyphae 2.5-3 µm diam. with hyaline and thin walls. Upper wall 10-25 µm thick, comprising several rows of angular cells 4-6 µm diam. with very thick and very dark walls, the cells paler and thinner-walled along inside edge of wall. Lower wall 10-15 µm thick, comprising a compact layer of angular cells 4-8 µm diam. with thin and hyaline walls, lined with the conidiogenous layer.
Conidiogenous cells 14-19.5 x 7-9.5 µm, cylindric, with a series of prominent annellidic rings in the upper part (the annellidic rings poorly developed in PDD 992, if present then restricted to 2-3 rings), with a broad, single, apical conidiogenous locus; solitary, forming palisade-like layer across lower wall of conidioma. Conidia 39-46 x 13.5-14.5 µm, broad-cylindric, straight, apex broadly rounded, base with small truncate scar, 0-septate, wall hyaline, smooth, about 1 µm thick.
Two of the Baeumleria nothofagi collections examined (the holotype and NZFRI 2334) are macroscopically very similar. The third collection (PDD 992) differs in having larger conidiomata, which develop on both the upper and lower surface of the leaves. PDD 992 also has less prominent annellations on the conidiogenous cells. The conidial locules on the type collection of Trabutia nothofagi, reportedly the teleomorph of B. nothofagi, has conidiogenous cells in which annellations were never observed. NZFRI 2334 has conidiomata which develop below the epidermal cells, while the other two collections are subcuticular. This may reflect anatomical differences between the leaves of the hosts of these collections, N. truncata and N. solandri var. cliffortioides respectively. Although the significance of these differences remains uncertain, for now they are considered to represent natural variation within the species.
See also notes under Trabutia nothofagi.