Monday, April 07, 2025

Purple diamonds?

There's always something new. Beside a trail I've followed umpteen times, a clump of moss now supports lichens I've not seen before. At first, down there in the shade, they looked like black, rotting leaves. But when I hunkered down to look more closely, I saw their orangey "buttons" and those white "roots".

A pelt lichen, Peltigera membranacea.

On iNaturalist, they call them Membranous Pelt Lichen; over on E-Flora BC, they're Diamond Pelt, I don't know why.

They can be brown or greenish or blue-black, darker when they're wet.

And here are the "roots".

Ok. Time to fix the vocabulary. Buttons and leaves and roots just won't do. The "leaves" are foliose (leafy) thalli, appressed (flat against the substrate), and described as "embossed" or blistered. The orange structures are the fruiting bodies, the apothecia. And the whitish underside of the thalli have raised tomentose veins and protruding rhizines (the "roots"). These don't absorb or transport  water or nutrients, but simply hold the thallus down to the substrate, in this case the moss. The lichen gets its nutrients from the air and rain. Tomentose? Hairy, but you need a lens to see that.

I've been having fun reading multiple descriptions of these lichens. One uses the expression "rhizinate rhizines", meaning rhizine-like rhizines. In pursuit of accuracy, I guess.
 

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Siempre hay algo nuevo. Donde he caminado muchas veces, ahora encontré un montoncito de musgos  con un liquen que nunca había visto antes. A primera vista, en la penumbra, parecía unas hojas podridas, negras. Pero cuando me arrodillé para ver mejor, vi los "botones" anaranjados y esas "raices" blancas.

  1. Peltigera membranaceaEn E-Flora BC, los llaman Piel Diamante, no sé porque.
  2. Pueden ser de color marrón oliváceo, o verde, o azul oscuro. Cuando están húmedos, el color es más fuerte.
  3. Y estas son las "raices".

Bueno. Hay que corregir el vocabulario. "Botones" y "hojas" y "raices" no sirven. Las "hojas" son talos foliáceos lobulados, adpresos (contra la superficie del sustrato), y con ampollas. Las estructuras anaranjadas son los cuerpos fructíferos, los apotecios. Y la superficie inferior blanquecino de los talos tiene venas resaltadas, tomentosas y ricinas extendidas (las "raices"). Estas venas y ricinas no absorben ni transportan el agua o los nutrientes, sino que solamente sirven para adherir el talo al sustrato, en este caso, el musgo. El liquen recibe sus nutrientes del aire y la lluvia. ¿Y tomentosas? Peludas, pero se necesita una lente de aumento para ver esto.

Me he estado divirtiendo leyendo varias descripciones de estos líquenes. Un sitio usa la frase "ricinas ricinatas", o sea, ricinas parecidas a ricinas. Para evitar dudas, será.

1 comment:

  1. Sometimes, I wish Latin was still taught more widely...
    Thanks for all your interesting observations.

    ReplyDelete

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