8 LICHENS TO KNOW AND LOVE
Ruffle lichen, Parmotrema hypotropum, is a large foliose lichen that is common on twigs and trunks of hardwood trees in open places. Look for a light gray color, and upturned lobes with long eyelash-like cilia. Reproduction is by soredia that occur in powdery linear masses (soralia) along the margins of the lobes. The undersurface is dark except near the margins, where there is a broad light band.
MANY-FORKED REINDEER LICHEN
Cladonia is our largest genus of fruticose lichens. Some species of Cladonia consist only of a distinctive tangle of hollow strands. These are the “reindeer lichens.” Many-forked reindeer lichen has a distinctive gray color, and, when examined closely, reveals a few flake-like “squamules” (Our other reindeer lichens are entirely smooth. Many-forked cladonia occasionally produces apothecia, but it reproduces principally by asexual fragmentation, as the reindeer lichens are ground-dwelling and extremely brittle when dry,
Common greenshield is a large foliose lichen that grows on bark. It’s easy to spot by color alone as is is a distinctive yellow-green, not the plain gray of most other lichens seen alongside it. Reproduction is by soredia, produced in powdery masses on the upper surface.
ROUGH SPECKLED SHIELD LICHEN
Rough speckled shield lichen is a medium-sized foliose lichen that is extremely common on trees. The genus Punctelia is characterized by minute (use a hand lens) openings in the upper cortex (pseudocyphellae) appearing as whitish specks. The species P. rudecta reproduces by isidia, and these presence of these structures help separate it from another common local species (P. subrudecta) which is sorediate.
British soldiers is a very popular lichen, and perhaps the only North American species with a well-known common name. It is a typical “cladoniform” lichen, i,e, a fruticose lichen that consists of two parts: a primary thallus which is the first thing to grow and is usually crustose or formed by numerous small plates called squamules, later followed by an upright structure called a podetium. In some cladoniform lichens, including this one, the podetia are tipped with apothecia (the “soldier’s” red “hats”). It grows on the ground or wood in open areas.
Lemon lichen is a brightly colored lichen that is very common on bark in open areas. Although it is most definitely foliose, sometimes the lobes are so small as to require a lens to make them out, and so it can appear crustose, especially when it is abundantly producing granualr soredia, as it often does. It you see a tree that looks as if it has been lightly spray-painted yellow, it is probably lemi n lichen. (Note: A lichen called “hooded sunburst lichen” (Xanthomendoza fallax) is another brightly-colored small foliose one that is common on trees in our area. That one is more golden-yellow. A chemical spot test -KOH – is helpful to separate Candelaria from Xanthomendoza.)
DIXIE REINDEER LICHEN
Dixie reindeer lichen is one of several tangled fruticose lichens that are completely smooth (lacking the little squamules on the podetia that characterize many-forked reindeer lichen). The branches usually end in twos, and the overall color a has a yellowish cast. have podetia terminating in cups. Dixie reindeer lichen is common on the ground in dry open areas.
MEALY ROSETTE LICHEN
This is a small lichen –up to one inch –that often coalesces to form a large mass covering a tree trunk. It is common in urban areas and is often seen on roadside trees. The finely dissected lobes are distinctive.
THE LICHENS ARE A FASCINATING SHOW!