Umbilicaria cylindrica

[ralfwagner]

Hello,

this is just another lichen of my collection:

- Habitus. Thallus ca. 4 cm, solid, upper surface grey with brownish dots witout isisdia. Bristle like black cilia at the margins. Central umbo. Lower surface pale, brownish, rarely with sparse rhizines. Apothecia frequent, 2 - 4 mm diameter, disc black, grooved. Chemistry: C-, K-, KC-, P-
On siliceous rocks in well lit montane, alpine situations.



- Closeup apothecia with black, grooved disc.



- Cross section lobe and apothecium. Lobes corticated on both sides, apothecium with thalline exiple and a central sterile core. Staining with Lactophenol-Methylblue-Acidfuchsin.



- Ascus with spores. Ascus 8 spored, amyloid. Spores simple colorless, 9-15 x 3-9 µm. Staining with Lugol.



Have fun!

[Mitch640]

Very nice images, and an interesting subject, I was just working up the energy to do some more slices, since it's spring. But now maybe I will wait and just look at yours.

[RogelioMoreno]

Very nice set, I like the details and colors.

Rogelio