Sample obtained from a rose in a flower bed at Caltech’s Moore Walk (Pasadena, CA) at 2:30 PM on 5 May 2019.

<figure class="wp-block-image">
 <img alt="Recitation 5 &amp;#8211; Rose &amp;#8211; Zoomed Out" class="wp-image-146890 gcloudimg" data-attachment-id="146890" data-comments-opened="1" data-image-meta='{"aperture":"1.9","credit":"","camera":"SAMSUNG-SM-J727A","caption":"","created_timestamp":"1557066713","copyright":"","focal_length":"2.9","iso":"40","shutter_speed":"0.0012853470437018","title":"","orientation":"6"}' data-image-title="Recitation 5 – Rose – Zoomed Out" src="https://storage.googleapis.com/microcosmosdelta.appspot.com/images/transfer_146888/Recitation-5-Rose-Zoomed-Out.jpg"/>
 <figcaption>
 Rose on Caltech’s Moore Walk
 </figcaption>
</figure>
<figure class="wp-block-image is-resized">
 <img alt="Recitation 5 &amp;#8211; Rose Pollen" class="wp-image-146889 gcloudimg" data-attachment-id="146889" data-comments-opened="1" data-image-meta='{"aperture":"1.9","credit":"","camera":"SM-J727A","caption":"","created_timestamp":"1557066481","copyright":"","focal_length":"2.9","iso":"40","shutter_speed":"0.0083333333333333","title":"","orientation":"6"}' data-image-title="Recitation 5 – Rose Pollen" height="780" src="https://storage.googleapis.com/microcosmosdelta.appspot.com/images/transfer_146888/Recitation-5-Rose-Pollen.jpg" width="585"/>
 <figcaption>
 Rose Pollen at 560x Magnification
 </figcaption>
</figure>

 This rose (Rosa rubiginosa) pollen was rubbed directly onto the slide from the stamen of flower to collect the sample for viewing.


 With a foldscope magnification of 140x with the image itself at 4x magnification, these images total to 560x magnification. Judging by the approximately 1 cm length of the grains in the image, we can conclude they are approximately 18-36 micrometers in length.


 #caltechbi1

Rose Pollen

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