Sunday, May 05, 2024

Pie crusts and green peas

I think these are my favourite mushrooms: delicate, creamy, gilled mushrooms with pie-crust edges and a "navel". 

Except that they're not really mushrooms; they're the fungal component, the fruiting body, of a lichen. They never grow alone, but always in a symbiotic relationship with a green alga, Coccomyxa sp.

I usually find them in deep, dark woods, growing in old wet logs. Here, in the little wood at Oyster Bay, they have extended their patch this year to the more open area on the edge of the dunes, finding shelter inside mossy logs.

Lichen agaric, Lichenomphalia umbellifera.

Look closely at the photo; see that dark green coating on the old wood? That is the single-celled blue-green alga, Coccomyxa sp. Seen close-up, it forms nearly microscopic green balls or bubbles. I found another name for these today; the green-pea mushroom lichen. That's exactly what the alga looks like. Here it is, under my home microscope:

Coccomyxa sp., with moss and Cladonia lichen, April 2021

View of the gills.

Here's another view, another log.

Lichen agarics, against a dark background of the green alga. With Cladonia lichens and some moss.

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Creo que estos hongos son mis favoritos; honguitos delicados, cremosos, con un borde ondulado como el de un pastel de frutas, y además un "ombligo".

Pero es que no son hongos, sino el cuerpo fructífero de un líquen. Nunca aparece el "hongo" solo, sino que existe siempre en una relación simbiótica con un alga verde, Coccomyxa sp..

Normalmente los encuentro en bosques oscuros y húmedos, creciendo dentro o encima de troncones bien podridos, y mojados. Estos, creciendo en el bosquecito de Oyster Bay, han extendido su zona este año, apareciendo al borde de las dunas, pero siempre refugiándose dentro de troncos cubiertos de musgos.
  1. El hongo liquenizado, Lichenomphalia umbellifera. Examina con cuidado la foto; ¿ves esa capa verde oscura sobre la madera? Es el alga verde unicelular, Coccomyxa sp. Vista de cerca, se nota que forma pelotitas o globos verdes casi microscópicos. Hoy descubrí otro nombre; el hongo liquenizado "chícharos" (guisantes). Y eso es precisamente lo que parecen.
  2. Aquí están esas algas vistas bajo mi microscopio, con musgo y líquenes Cladonia sp. en abril de 2021.
  3. Vistos desde abajo, mostrando las laminillas.
  4. Otro grupo, en otro troncón. Lo verde oscuro en el fondo es el alga.


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