Observation 202406: Phaeographis smithii (Leighton) B. de Lesd.
When: 2015-04-03
Who: zaca
No herbarium specimen

Proposed Names

58% (1)
Recognized by sight
86% (1)
Eye3 Eyes3
Used references: Ref. 1 – M.E. López de Silanes and J. Álvarez, The genus Phaeographis Mull. Arg. (Graphidaceae, Ascomycotina) in the Iberian Peninsula, Nova Hedwigia 77 (1-2): 147-160, 2003.
Ref. 2 – British Flora: Smith et al. (eds.), the Lichen of Great Britain and Ireland, The British Lichen Society, 2nd ed., 2009.
Based on microscopic features
Based on chemical features

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

Add Comment
Microscopy added.
By: zaca
2015-04-10 17:48:40 EDT (-0400)

There are only four species in this genus here: P. dendritica, P. inusta, P. lyellii and P. smithii. P. inusta and P. lyellii have much smaller spores and less septate. P. dendritica and P. smithii are often confused, though the former has bigger spores (in average) with more septa. According to Ref. 1 the values for the spores are:
- P. dendritica: (24-)28-49 µm, (5)6-9 sepate,
- P. smithii: (20-)25-35(-42) µm, (3-4)5-6(7) septate.
With slightly variations these values are also is accordance to Ref.2.
A common feature usually indicated for P. smithii is the open exciple under the hymenium. However, in Ref. 1 this feature is not to much valued, since open or closed exciples can be found in different sections of the same apothecia.
For this specimen all the sections observed have open exciple and I got the following values:
Spores dimensions:
(27.5) 30.1 – 37.8 (41.5) x (7.1) 8.3 – 10.2 (11.5) µm
Q = (3.1) 3.3 – 4 (4.5) ; N = 54
Me = 33.7 × 9.2 µm ; Qe = 3.7
Spores septation: (5)6-7.
Therefore, I would say that, if P. smithii exist here (and it seems that this is the case), then this is it.

Created: 2015-04-07 15:50:16 EDT (-0400)
Last modified: 2015-04-10 17:47:01 EDT (-0400)
Viewed: 36 times, last viewed: 2016-10-22 08:35:20 EDT (-0400)
Show Log