Observation 222886: Phycomyces blakesleeanus Burgeff
When: 2015-11-14
Who: zaca
No herbarium specimen

Notes: Growing on dung.

Proposed Names

29% (1)
Recognized by sight
86% (1)
Eye3 Eyes3
Used references: K. Bergman et al., Phycomyces; Bacteriological Reviews, Mar. 1969, p. 99-157.
Based on microscopic features

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Eye3 = Observer’s choice
Eyes3 = Current consensus

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By: zaca
2015-11-18 08:50:59 NZDT (+1300)

I knew already the existence of two species in the genus Phycomyces, but I was not aware of the differences. Now I found the reference given, that refers has many information on this genus.
I don’t resist to cite some information from the reference given:

“Currently there are three species recognized in this genus (Phycomyces), only two of which are available, viz., P. blakesleeanus and P. nitens (8, 35). Practically all recent work has been done with strains of P. blakesleeanus and most of the data reported in this review refer to it. The principal difference between the two species is the spore size, those of P. nitens being larger. The two species interact sexually, and this interaction leads to the formation of zygospores which germinate and form germ sporangia with spores. The spores, however, are sterile (35).”

“Their size is one of the principal morphological differences between the species; those of P. blakesleeanus are 8 to 13 by 5 to 7.5 um; those of P. nitens are considerably larger (8).”

On the other hand, searching Mycobank for P. nitens I saw in the description that:
“sporangiospores smooth, hyaline, with contents faintly yellow-orange (especially in the center), mostly oblong-elliptical to oval in shape but a few globose and a few nearly reniform, 10.5-30 × 6.517 µm, averaging over 15 µm in length, where globose, 10.5-19.5 µm in diam.”
Accordingly, taken into account the dimensions of the spores obtained:
(6.9) 7.8 – 11.2 (11.9) x (4.2) 4.9 – 6.7 (7.8) µm
Q = (1.1) 1.4 – 1.8 (2.2) ; N = 30
Me = 9.3 × 5.7 µm ; Qe = 1.6,
this specimen is P. blakesleeanus.

Created: 2015-11-15 07:38:12 NZDT (+1300)
Last modified: 2015-11-18 08:52:00 NZDT (+1300)
Viewed: 15 times, last viewed: 2016-03-17 18:40:13 NZDT (+1300)
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