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19-03-2011, 09:00 AM
|  | Commander of the Wild Empire | | Join Date: Nov 2007 Location: York
Posts: 3,314
| | | Pilobolus
Does anyone know if there are any differences between P roridus var umbonatus and the other Pilobolus other than the shape of the sporangium. If there are none is this var umbonatus? 
Thanks
Mal |
19-03-2011, 10:02 PM
|  | Commander of the Wild Empire | | Join Date: Oct 2008 Location: Huddersfield, West Yorkshire
Posts: 3,648
| | | Re: Pilobolus
Hi Mal
this is from:
MYCOTAXON Volume 104, pp. 111-122 April-June 2008
Pilobolus (Mucoraceae) from herbivore dung in Recife, Pernambuco, Brazil
ANDRE LUIZ CABRAL M . DE A . SANTIAGO, MARIA A . Q . CAVALCANTI
& SANDRA FARTO BOTELHO TRUFEM
"Pilobolus roridus (Bolton) Pers. var. roridus
SPORANGIOPHORES erect, long-cylindrical , unbranched, nonseptate, smooth-walled, phototrophic, 3- 6 mm x 85-49 0 um. TROPHOCYSTS ovate-ellipsoid, 230-385 x 125-290 um. SUBSPORANGIAL SWELLINGS ovoid, orange at base, 230-55 0 x 210-49 0 um. SPORANGIA hemispherical , black, 96-15 0 x 130-310 um. COLUMELLAE plane-convex, dark gray, 85-115 x 150-300 um.
SPORANGIOSPORES elliptical, light yellow, 4- 7 x 3-4.5 um. ZYGOSPORES not
found.
Pilobolus roridus var. umbonatus (Buller) F.M. Hu & R.Y. Zheng
SPORANGIOPHORES erect, long-cylindrical , unbranched, nonseptate, smooth-walled, phototrophic 3- 9 mm x 85-145 um. TROPHOCYSTS buried in the substratum, ovoid to napiform, 190-395 x 140-270 um. SUBSPORANGIAL SWELLINGS ovoid to ellipsoid, orange at base, 340-680 x 265-46 0 um. SPORANGIA hemispherical , umbonate, black, 130-190 x 150-230 um. SPORANGIOSPORES ellipsoid, light yellow to hyaline, 5-8 x 3.5-4 um. COLUMELLAE not visualized. ZYGOSPORES not found."
so I think that the answer to you question is that the chief difference is the umbonate sporangia - a feature clearly deemed only to merit varietal status (but this feature is unique among the members of the genus Pilobolus!)
cheers
Chris
PS was this in Yorkshire? - thanks for drawing my attention to this taxon - I've just checked and there's a record I've missed from the Hawes area in 1999 (Mike Richardson of course!). I'm just totting up the grand total of Yorkshire fungi . . . yet another to add!
__________________
"You must know it's right - The spore is on the wind tonight"
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Last edited by Chris Yeates; 19-03-2011 at 10:10 PM.
|
19-03-2011, 10:47 PM
| | Commander of the Wild Empire | | Join Date: Nov 2007 Location: York
Posts: 3,314
| | | Re: Pilobolus
Thanks for that Chris. As I have seen neither before I am happy with either P. roridus or var umbonatus and both are quite infrequent. I suppose that could be because not many people go round collecting deer dung to take home. If I hadn't noticed the umbonate shape I would almost certainly have logged it as P crystallinus.
Mal
Ps yes in Yorkshire | | |
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