Collection location: Thompson Pass, Valdez-Cordova Census Area, Alaska, USA [Click for map]
Jason – thought I’d run some lichens I was looking at past you.
I was confused because Brodo (2001) keys Gowardia nigricans (as Alectoria nigricans) as dull gray to yellowish gray at the base with blackened branch tips, occasionally entirely black, with pseudocyphellae raised, white. Alectoria ochroleuca keys in Brodo (2001) (p. 150) as pale greenish yellow or yellowish green with pseudocyphellae conspicuous and usually slightly raised, tips of branches usually becoming black or greenish black.
The “yellowish” possibility and “raised” pseudocyphellae are at odds with the latest word of Halonen et al. (2009) who have Gowardia as characteristically is pale/dark bicolorous to entirely black with pseudocyphellae usually plane, white, mainly 0.2-0.5 mm long. They state "Gowardia is easely distinguished from Alectoria on the basis of cortical pigments. Alectoria contains usnic acid and has a yellowish or greenish-yellow hue, while this substance is lacking in Gowardia, which instead has melanic pigments yielding a grayish to blackish color.
This seems to have a touch of yellow.
|User’s votes are weighted by their contribution to the site (log10 contribution). In addition, the user who created the observation gets an extra vote.|
|I’d Call It That||3.0||0.00||0|
sum(score * weight) /
(total weight + 1)
Created: 2013-01-28 17:38:24 GMT (+0000)
Last modified: 2013-01-28 17:38:25 GMT (+0000)
Viewed: 31 times, last viewed: 2017-06-15 14:33:30 BST (+0100)