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 Add this item to the list  563959 NO1
   
Page number:740 
Remarks (internal):The arrangement of conidiogenous cells of the M. snyderi mitospore stage (Fig. 6) is more uniform and setae apices are generally wider diam relative to M. brunnea and M. populiphila based on the collections examined (Fig. 5). Mitospores are one- and occasionally two-nucleate (Fig. 6k), but have not been observed to germinate. Morchella snyderi corresponds to O’Donnell et al. (2011) phylogenetic species Mel-12, and in our experience is the most common black morel in coniferous forests in northwestern Idaho. Mitospore stages of this species are similarly abundant in these forests and were observed forming colonies on woody debris (Fig. 6c), soil (Fig. 6f) and moss (Fig. 6g). Colonies forming on the underside of decaying logs also may extend down on soil and moss beneath the wood. Morchella snyderi typically fruits in unburned forests, but also may form large flushes, with Gyromitra cf. esculenta, in sites logged the previous year. Of interest, no M. snyderi mitospore stages were collected in autumn 2011 at the Brush Creek Trail site that had been selectively logged in 2010 and where a flush of M. snyderi ascocarps was present in May 2011.  
Description type:Non-original description 
Description:Mitospore stage of Morchella snyderi Figs. 5b, 6c, f-l
Colonies on soil and woody debris. Colonies effuse, cottony, fawn-colored. Mycelium superficial. Hyphae pale to medium brown, smooth or verruculose, 13-17.5 µm diam. Setae arising from basal hyphae, pale brown, septate, verruculose, 440-700 µm long, 10-15.5 µm diam at base, 9-11 µm diam at apex. Conidiophores erect, semi-macronematous, mononematous, arising laterally from base of setae, pale brown and verruculose at base, hyaline and smooth above, irregularly branched with 0-2 secondary branches, 160-400 µm high, 6-11 µm diam at base. Conidiogenous cells polyblastic, discrete formed in verticils of 4-6 cells, usually arising below conidiophore septum, lageniform, 9-20 × 4.5-7 µm; denticles cicatrized, unilateral, forming adaxially on recurved crest up to 9 µm long. Conidia solitary, dry, globose, aseptate, 4.5-5.5 µm diam. Colonies on PDA at 20-25 C covering 9 cm diam plate in 7 d, with sparse, white aerial mycelium; sclerotia initials forming as golden yellow masses of hyphae on the agar surface; pale reddish brown pigment with dark reddish brown sectors developing in agar. Sclerotia up to 2 mm diam formed on agar surface at 1 mo; sclerotia dark reddish brown, covered in orange yellow hyphae. No mitospores produced in culture.

 
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