Schneider (2004) questioned the identity of the Martinique material based on the presence of more than one
sporangium per whorl-branch and the elongated outer cortical cells, which, according to him, are not in agreement with the original description of C.
The outstanding character of one sporophyte/one
sporangium per fertilization event has lead to thumbnailing these plants as "monosporangiates".
Sporangium discharge in Pilobolus: a photographic study.
The last
sporangium has spores significantly smaller than the other two, and, interestingly, a mixture of spores from the UAE specimen (not taken from individual sporangia) had a bimodal size distribution, with some spores larger (~63 um), darker, and more strongly and evenly tetragonal than the others (which were ~49 um in diameter, more transparent, and irregularly shaped).
Conidiospores are unprotected spores formed by mitosis at the tips of hyphae, and sporangiospores are spores produced within a sac called a
sporangium.
Characteristic sporangia (s) containing zoospores (z) are visible in the epidermis (asterisk, superficial epidermis; arrow, septum within an empty
sporangium; bars, 10 [micro]m).
Each
sporangium contains up to 20 endospores that are released on rupture.
Sporangium wall whitish (unpigmented); megaspores with honeycomb-like ridges (reticulate); plant aquatic (submerged or emergent), usually not associated with rock outcrops I.
The PIBs are known to be coformed during sporulation within the
sporangium or spore-mother cell, but exact details concerning molecular and cellular events in their formation and maturation have not been obtained.
Then it produces a very distinctive capsule (
sporangium), as can be seen in the photo.
Therefore, to evaluate synchrony in spore release in Pterygophora, we measured weekly changes in
sporangium density during the reproductive seasons of 1991 and 1993.