CA, Southern California, 20071014
Madison Heights, two mushrooms. 

My favorite lawn for LBMs: NW corner of Fillmore and Marengo.  Looks like some Mycena today along with the usual Agaricus californicus and Panaeolus foenisecii.

Beautiful young one, side view. Beautiful young one, quarter view. Spores, at 1000x. Cystidium?, at 1000x. Cystidium?, at 1000x. Cystidium?, at 1000x. Basidium and spores, at 1000x. Gill section, at 400x.  Is that oblong cell a cystidium?  Some nice basidia visible.  Parallel tissue also clear. Older one, knocked over. Fresh bunch, in straw. Older one, in straw, top view. Perfect young one, in straw, side view.  Blurry.  Shows white fringe. Two perfect young ones, in grass, quarter view. Close-up of base of stem. Close-up of cap margin.  Color is fairly accurate. Close-up of gills.  Shows milky latex from cut stalk, too. 

Mycena pura-group [] 

 GEN tiny mushrooms, scattered, in straw mulch at edge of and in well-manured lawn, indistinctive odor
 ST 20-30x1.5-4mm, watery offwhite to buff, min white appress hairy to rather cottony at base, hollow, doesn't break when bent, creased lengthwise on one, exudes mulky latex when cut
 CAP 10-30mm, domed to broadly convex, lustrous from minute hairs when young but aging dull, rich medium reddish brown fading a bit toward margin, margin a bit tattered w sharp white edge in some young ones, translucent striations, flesh brownish, very slippery esp when moist/fresh
 VEIL none
 GILL attached, somewhat distant, quite thick at base (to 1mm), whitish but blushing brownish inside when young, hyphae parallel, cystidia? 
 SPORE whitish to v pale yellow, ellip, smooth to faintly textured, one bubble inside, apiculate, 8.5-9.5x5.6-6.5um, sticking together in irreg towering masses when dry
Key to Mycena in Arora always defeats me.  Best candidates seem to be:

M. "grass" (Gives no description.)
M. vulgaris (How viscid is the cap?  Doesn't mention reddish tint of cap.)
M. galopus (How milky is the latex?  Cap dry, and not red.)

Nathan Wilson has IDed this as Mycena pura-group for me  apparently common in LA lawns.  His mushroomobserver.org observation from Burbank has a great deal more information.

Spores, at 1000x.  Shows the little pore at the end of the one just above center nicely. Spores, at 1000x. Spore print.  Color varies so much depending on light that it is silly to photo. Fresh small clump, one knocked over. Fresh small clump.  Shows particles nicely. 

Coprinus micaceus [] 

Same corner, across the sidewalk from the Mycena above, just growing in the middle of the lawn.  Also another (not photoed) at foot of tulip poplar on SW corner (but grayer and no particles  different species?)
 SPORE print v dark brown (but almost purplish black against a white paper), brown, smooth, ellip, truncate at one end, v little "stuff" inside, 6.6-8.9x4.6-6.1um

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